We were three adults from Canada and the apartment suited us very well. It is close to many restaurants and pubs and there is a grocery store a block away. The best ice cream in the world at the Hoky Poky is also just a few blocks away!
The tram is a short walk and runs directly downtown to Alexanderplatz. Also the metro which connects to the airport is at the end of the block.
Berlin was having a a heat wave during our stay, but the apartment remained cool and Michelle kindly supplied a fan for each room.
Having a washer and dryer (2 sets actually) was great - just be sure to empty the water out of the dryer!
The apartment also has lots of tour guide books which was handy.