We had a pleasant stay at Mary’s apartment. It’s small (as advertised) but comfortable for a few days and had everything we needed. Kennington was a great location for us because the northern line connected us to everywhere we wanted to go, and the tube station was only about a 7 minute walk from the apartment. Check in was easy thanks to the lock box outside, and the instructions provided were very clear. Mary was also quick and helpful in all her communications with us. The only downside was that there was a loud creaking when the upstairs neighbours walked around (which was unfortunately often during the night also) so I would suggest bringing earplugs to help with this. All in all a good stay though :)