Rukshana has a lovely apartment with good public transport connections and a lift to get you up to the fourth floor. Although we didn't meet him, he was always available via email, and we found him both friendly and helpful.
The apartment is large, light, and clean, with a lovely South Asian touch, and it felt like he welcomed us into his own home. There is a kitchen for making breakfast, and a large living room.
This makes a great base for exploring Berlin, and if you go off the main streets you will find interesting cafes, bars, restaurants, galleries, antique shops, and all sorts of delights.