It's a small apartment (one room, one hall with a sofa-bed for two, kitchen and bathroom) in a very quiet neighbourhood 10-15 min. from the main train station and 15-20 min. from Reichstag and Brandemburg. It was reasonably clean and equipped and it was a comfortable base to explore Berlin.
Regarding the cost, bear in mind that a hefty tourist tax is charged and collected by the owner and a late arrival surcharge was applied.
The owner was friendly and easily reachable and explained all the details of the house.