The apartment is really beautiful. Unfortunately I did not use the terrace, which looks really nice for warmer weather.
The bed is not the most comfortable, the mattress is right on the floor and only a single duvet for a double mattress. But it was fine for a few nights.
The area is nice - a short walk or metro to access key sites in Berlin and there are nice restaurants/cafes nearby.
Host arranged for someone to be there before check in to meet me so I could leave my bag which was nice.