We stayed at the Homage Apartments for 6 nights and absolutely loved it there! It's in the Mitte district, so it's not in the heart of the action in Berlin but it is a nice quiet place to stay.
The apartment was clean, spacious, really well decorated and had everything we could need - kitchen, comfortable beds, large bathroom, iron + ironing board, washing machine, clothes airer, wifi......
The station is not far away (10 min walk) so it is easy to get around town, but be prepared that it's a little bit of an uphill hike to get there when you have luggage with you :)
There are also plenty little cafes, mini marts and supermarkets nearby.
Nothing to complain about - definitely recommend as a great place to stay.