From Peter's apartment you can indeed see the TV tower from your bed, it's a really nice landscape to fall asleep and to wake up!
The studio is in a perfect location, you are really close to Hackescher Markt station and also to Alexanderplatz (the station and the square obviously).
However you can walk to the major sightseeing, like the Berlin Dom, the Island Museums, even the Brandenburg Gate, the Memorial to the death Jews and so on.
For a two people is a really good place to stay, it's cozy and is nicely equipped.
I would strongly recommend staying here and, as I mention to Peter, my only complaint is that I stayed for too short! I hope I'll be able to be back there again.