The apartment is very clean and modern in a beautiful renovated old building right next door to a lovely old church. You can walk to the main attractions from there or use the U underground which is right outside the apartment.
Boian and Olga are lovely and very helpful. They provide you with milk, juice, bread, croissants, cheese and ham for your breakfast. Plus there is a coffee machine and plenty of tea choices.
It is easy to catch the train from the airport straight to Alexanderplatz and then walk or catch the tube for one stop.
We didn't find many restaurants nearby but there were plenty to choose from three stops north on the tube.
We had a great weekend in Berlin.