The hotel is part of the look: what a high class evening asks of its address

01The venue belongs to the outfit

Nobody pairs a beautiful jacket with scuffed shoes, and an evening obeys the same rule. The company can be superb and the table flawless, yet if the hotel wobbles, the whole picture wobbles with it: a lobby that cross-examines, a bar that closes at eleven, a room where two chairs stare at a television and at nothing else. A high class evening asks more of its address than a comfortable night of sleep.

Anyone staying in Mayfair has a head start. Few corners of any city pack so many serious hotels into so short a stroll: Brown's on Albemarle Street, Claridge's facing Brook Street, The Connaught behind its misty fountain, and the tall row of grand houses along Park Lane facing the trees of Hyde Park. What follows is the minimum bar we think a five-star booking should clear before it earns a place in your plans, written from a desk that sends companions through these revolving doors at every hour.

02Standard one: a front door that asks nothing

The first test takes place on the pavement. A good door opens before you reach for it, and the person holding it looks pleased rather than curious. Grand hotels receive visitors all evening, for the bars, for dinner, for friends staying upstairs, and the finest houses give every one of them the same unhurried courtesy. Stand for a minute on Carlos Place, where Tadao Ando's Silence fountain breathes a low mist beneath two trees outside The Connaught, and you will watch a steady stream of people walk in without a single question.

The ideal is a lobby that behaves like a drawing room, not a checkpoint: somewhere to sit, a clear line to the lifts, staff who greet and then step back. Some hotels ask that visitors be met downstairs after a certain hour, or that the lift be called with a room key, and that is simply sensible security. The question is whether it is handled warmly. Your companion arrives by car, walks in as any dinner guest would and messages you from the lobby, so a door with good manners turns those first thirty seconds into nothing at all.

03Standard two: a bar worth being seen in

A hotel without a proper bar has one room fewer to offer the evening. The bar is neutral ground for a first hello, the natural home of a one-hour booking at £400 spent over a single beautifully made drink, and the place where a longer night gathers speed before dinner. Mayfair is spoiled for choice. Claridge's has its Art Deco bar and, tucked behind it, the tiny, deliberately dim Fumoir. At The Connaught Bar a martini trolley rolls up to the table and the drink is assembled while you watch. Brown's keeps the Donovan Bar, its walls lined with Terence Donovan's black and white photographs, and The Dorchester pours at its Vesper Bar.

Hold any of them to four simple tests. The light should be low enough to flatter and bright enough to read a menu. Tables should stand far enough apart that a conversation stays your own. Non-residents should be welcomed without fuss, because your guest is one, at least for the first glass. And last orders should come late enough that a plan can change at half past ten without anybody reaching for a coat in a hurry.

04Standard three: a room built for conversation

Upstairs, the brief shifts from glamour to comfort. A room that suits an evening has a genuine sitting area: two armchairs or a sofa turned towards each other, a low table big enough for a tray, a lamp that is not a ceiling spotlight. This is where junior suites earn their premium, because a separate sitting room turns a visit into hosting, and hosting is what makes an evening feel like yours.

Sound matters as much as square metres. The old houses along Albemarle Street and Brook Street tend to be hushed behind thick walls, and on the upper floors of the Park Lane hotels the traffic below fades to a murmur while the windows fill with treetops. Ask for a room away from the lifts and the service stairs, and if a park view is offered, accept it. On a clear night, the view does half the work of the opening conversation.

05Standard four: a kitchen still awake at midnight

Evenings keep no office hours, and a serious hotel should not either. In-room dining around the clock is usual at five-star level, but it pays to ask what that means after midnight: the full menu, a shortened one, or a sandwich and a pot of tea. A companion booked for three hours at £1,050 will happily skip the restaurant altogether if a proper supper can be wheeled in under a cloth, with a bottle chosen from the same list the dining room uses downstairs.

The same goes for the small things that separate a great hotel from a merely expensive one: an ice bucket that arrives in minutes, real glassware, a corkscrew and a second set of glasses without a follow-up call, a room tidied while you were at dinner rather than during your return. Nothing here is dramatic, yet every bit of it registers with a guest who sees the room with fresh eyes.

06Standard five: discretion as habit, never as favour

The final standard is invisible when it works. A great hotel does not remark on who visits, does not call out names across the lobby and does not confirm to a stranger on the switchboard whether you are staying at all. Most five-star desks will flag a reservation as private on request, so that callers hear neither yes nor no. It costs nothing to ask at check-in.

Recognition, done properly, sits beside discretion rather than against it. The Column has a whole piece on being known by name at the desk, and another on the houses whose staff anticipate instead of merely reacting. The short version fits on a luggage tag: the finest hotels remember what you like and politely forget everything else.

07The five-question test, and a guest who reads rooms

Before you commit to the room, put the hotel through five quick questions:

08Choosing the company to match the building

Five yes answers and the hotel is ready for anything, from a single drink to a night that runs until breakfast. Then choose who joins you. Samanta, a tall, sleek brunette in her late twenties, clocks the weight of a room key and the warmth of a lighting scheme long before she opens a menu, which makes her the ideal guest in a hotel you are proud of. Patricia carries a pocket sketchbook of favourite lobbies and may well add yours in a few quick washes of watercolour before the evening is out. Both sit in the statuesque edit, a natural fit for the high ceilings of the grand Mayfair houses.

Tell Bella the hotel and the hour, and she arranges the hotel visit with the same care you took over the room itself. A short message is waiting on the booking page, ready to send on WhatsApp or Telegram.