The apartment itself is wonderful- spacious, bright and fitted with all the neccessary amenities. It is located in a lovely neighbourhood, close to plenty of supermarkets, cafés and parks. The proximity to Alexanderplatz (one tram journey/a 15min walk away) with its excellent public transport links means it is easy to explore the city.
Stefano was the perfect host - communicative, helpful (he installed some curtains in one of the windows when I asked) and understanding when there were a few billing issues.
I wouldn't hesitate in recommending this apartment and host to anyone looking for a pleasant stay in Berlin!