We chose this hotel due to its star rating and the aesthetics of the building and accommodation. This was a special trip to celebrate a milestone birthday and we wanted a luxurious treat and the hotel delivered in almost every way. This being a high end mid sized boutique hotel in London's Knightsbridge, we interacted with most of the staff and the service was impeccable, courteous, professional and polite....top marks! The rooms we had (queen sized beds) were located in what would have been the attic space, so were compact but cozy, with a vaulted ceiling, beautifully decorated with comfortable beds and quality linen, the beds were changed daily. One slight negative was that the bathrooms were tiny! The door way was narrow and the door would only partially open due to a bath robe hung on the back and a door stop restricting access, you literally have to walk in side ways to enter which was a bit awkward, however I'm sure there are other rooms with larger bathrooms, so you should enquire about this when booking. There was a full size basin right next to the toilet and to sit at the toilet was awkward, you literally had your legs under the sink. Space is severely restricted and a smaller basin would have been a better design choice, however these bathrooms were nicely finished, spotlessly clean with quality products and fluffy towels. Our rooms were on the top (3rd) floor. There are multiple stair cases and a small lift for access, however the lift only goes as far as the 2nd floor and the 3rd floor is reached by a narrow steep stair case, so anyone with mobility issues may find this a struggle to navigate and should request a room on a lower floor. We had breakfast in the breakfast room, which was pleasantly decorated with a quirky edge (as are the public areas) the breakfast room looks out onto a small walled terrace garden, where weather permitting you can dine alfresco or enjoy a drink. Unfortunately the breakfast service was were we had a few issues. There appeared to be only one waiter on hand and the room was virtually full which resulted in very slow service. We ordered our food and when it eventually arrived, the food was cold, as were the plates and both our eggs had been over cooked and were hard, not what you'd expect at a 5 star hotel at this price point. We sent the plates back to be re-done and in due course they returned, the food was fresher/ warmer and the eggs were fine, but the plates were still stone cold! We decided to breakfast elsewhere after that experience. We noticed other guests were having the same issues with the slow service and getting very frustrated, which given the service elsewhere had been exemplary was very disappointing. To be fair to the hotel, when we were preparing to check out, they asked us for feedback on our stay and we mentioned the issues at breakfast, and when we finally checked out, they had removed the breakfast charges and also the charge for a couple of drinks we had had the previous day, so although the breakfast service should have been better organized and delivered, it was good of them to remove the charges. Would I recommend Number Sixteen, yes, despite the breakfast issues, the hotel is lovely and the staff excellent. just be mindful of access to the 3rd floor and the size of the rooms/ bathrooms!…