We met with Natalia, the City Relay agent, outside the flat. She was super nice, checked out the flat and showed us and provided us everything we needed to know. There was a broken kettle and she arranged and bought a new one and delivered it to us within 1 or 2 days.
The apartment is very comfortable. The Wandsworth area (and surrounding areas as well) is affected by Heathrow Airport, so you can hear a bit of the noise from the planes overhead. However, the street and location itself is quiet.
One thing I would recommend to the City Relay is to send less emails and messages. On the day we checked out I received 4 emails and 1 message. Only 1 email was really relevant and useful to check out.
We do enjoyed our stay here and would definitely recommend it.