Very nice and cosy apartment, the "check-in" procedure was smooth and the directions were clear.
The communication with the host was easy and helpful. But, in general, it may even be not necessary.
The apartment is less than 5 min walking from Marylebone underground station, which is very convenient.
No elevator, but it is on the first floor (above ground level).
We had a very nice stay (we were a couple + 1 adult) and would definitely recommend this place.