We stayed for 3 nights on a business trip for me and a shopping trip for my wife with some seeing of friends thrown in. Number Sixteen was a very convenient base for all elements, very central a few paces from South Ken tube but in quiet side street. The staff were friendly - the nice man who showed us to our room was exceptionally determined to show us everything on arrival. Reception staff and others were unfailingly pleasant and helpful and cheerful.
The deluxe room was well-appointed - very comfortable and large bed (exceptionally comfortable pillows), large enough room to be comfortable but no more, hanging cupboard with real hangers you can actually lift out and put back (one of our hates the chain hotel type you now get in many quite reputable hotels) good polished granite style bathroom with bath and shower and space to set things. No extractor fan, and a tap that made getting cold water a challenge. Air conditioning in the bedroom but as always a bit noisy so we vacillated between leaving it on and off all night, as the room tended to be too hot even in cold weather
Minibar and safe. Good drawer space/ Third floor is probably quietest but lift only to second floor and then narrow steep staircase unsuitable for people of limited mobility. There is ready assistance with luggage so this was not a problem for us.
Courtesy laptop downstairs for residents. Wifi available for 20 pounds a day which we thought exceptionally expensive and didn't take. Staff willingly printed off a small document transferred to them by email from the residents laptop.
Honesty bar, which is always a charming touch, and was well-stocked and easy to use., whether for taking drinks to the room (minibar stock less well chosen) or consuming downstaris, and a pot of tea or coffee always readily available anywhere on request.
The two downstairs rooms quickly felt quite small when even one of two small groups of people were present (and their conversations intrusive), but wonderfully like being in someones living room when you more or less had them to yourself. The breakfast room is also quite small, overlooking a pleasant garden space, the room a bit pain quotidien in table style and layout. Excellent breakfasts with fresh fruit (some tinned thrown in for the addicts), greek yoghurt, fresh individual coffee and of course english breakfasts available.
Expensive of course but all decent London hotels seem to be expensive and this one no more than you would expect for such a location and this standard.