My wife and I had a lovely stay in London in the heart of the city. Superb location, cozy apartment with even a dedicated booklet/guide. We couldn't have wished for more for our stay.
We visited London in the middle of November and it was cold outside (about 0C) but on the inside it was warm and romantic. Some people say it's noisy from the street outside - we didn't have problems when windows are properly closed. The bad is very comfortable. Stairs are a bit narrow but that might be an issue only at check-in and check-out as you typically have bags with you. The house has multiple small floors so there were other guests as well but they were quiet and respectful so no issues at all.