I was a bit hesitant to stay at a private room, but believe me when I say that we couldn't have picked a better place for our holiday. Right from the get go Claire was very responsive and was able to arrange check in earlier than indicated, which is something we very much appreciated as our flight arrived early in the morning.
The room itself is indeed very private and the photos are very representative of the space. It was not large, but it was enough for two people and since you probably will not be spending much time there anyway you won't notice it very much. Though if you would be staying a longer time (we stayed for 5 days), then the lack of space may become an issue for you. The en-suite bathroom was very nice, clean and had all the necessary amenities provided for our stay.
The property is located in Bloomsbury and is a minute away from the British Museum, which if you are arriving in London for sightseeing then you will certainly visit it. It is also very central, with shops, restaurants and entertainment within walking distance. While the property is very central, since London is such a big city, you will most probably still be using public transport, so it was very nice that an underground stations is only a 5 minute walk away.
The best thing with staying at Claire's place was that at no point did I (or my girlfriend) feel like we were intruding on someone's daily life. Claire and Mike were very friendly and welcoming and went above and beyond what we were expecting offering us tea and breakfast. If anyone is on the fence on whether to stay at Claire's, I can only assure you that if you would be staying here you would certainly be in good hands :)