The apartment was a good size for central London and the area (Mayfair) is lovely.
However the apartment is directly behind a large hotel's loading dock so there was a lot of noise overnight directly outside the main bedroom's window. There was intermittent activity (deliveries etc) from around 1:30am, with the daily 4:30am garbage collection being particularly lengthy and disruptive. For this reason we would not recommend this accommodation unless you are a very deep sleeper.