This review is mostly for the host. Due to issues with the lock on check-in, I never got into the apartment I had booked.
However: The host managed to get someone to help me within 40 minutes, and they showed up at 11pm on a Saturday, but were still friendly and polite.
Instead of forcing me to wait for a locksmith, they immediately managed to get me into a similar apartment in the same building, where they let me remain for the entirety of the booked stay.
I would definitely recommend the host for being responsive to messages and resolving issues quickly.
The building itself is as described very close to Mornington Crescent station, which did mean some noise from the street, especially Friday night, but it got quiet around midnight and sleeping was not an issue.
Aside from the issue with the lock, the check-in instructions were easy to follow, and the apartment I ended up staying in was nice and clean.