My boyfriend and I had a great stay at Amit's apartment for 3 nights. It is in a perfect location in Mitte, right next to the U-Bahn, with restaurants and museums close by. The apartment is in a quiet complex so set back from the main road - modern, clean, stylish with a very comfy bed.
Amit was out of the country at the time but we had great communication before we boarded our flight and we were met by his friend who gave us the keys. Amit gave us local recommendations of places to eat and very precise directions to get from the airport.
I would definitely recommend staying at Amit's apartment, you will not be disappointed!