The room was a perfect fit, providing us with everything we needed for our stay in London. It was really comfortable and clean. The location was excellent, really close to the subway/underground and quite close to main city attractions such as the Hyde Park.
We had a few problems regarding noise though. Our room was close to the elevator, which should be a perk, but the noise coming from it woke us up constantly during the night. The heater was also really noisy at times.
Besides that, there was also a scheduled AC maintenance that we weren't told about before scheduling our stay, and that required us to let people into our room while we weren't there, which made us uncomfortable.
Apart from those minor issues, our stay was really enjoyable and I would definitely recommend Sonder. Communication was excellent and the self check-in and check-out service were a plus.