Jonathan's apartment is located in the perfect location if you want to be able to walk to most tourist destinations (Westminster Abbey, the British Museum, etc), go out at swanky bars at night, and don't mind being in an area that is crowded with tourists. If you want something a bit quieter, this isn't a good fit, but I liked being so close to the places I wanted to visit.
The apartment itself is pretty nice, very clean and it was nice to have the soap and shampoo provided. The building has an elevator, and the apartment had AC, so don't worry about the reviews saying there is only a fan.
The only downside I saw was that the bed had a lump or something in the middle, like maybe it is two mattresses pushed together? I didn't bother to check, because I slept well, but if someone is more sensitive to that sort of thing, there might be an issue.
Checking in and out was very easy, and Jonathan always got back to me within a few hours or faster if I had questions. I definitely recommend staying here, just be prepared for crowds because the neighborhood is so popular!