Great location and beautiful flat!
Note to others that the TXL no longer goes to Alexanderplatz so the closest S station is Hackescher Markt and the closest U station is Weinmeisterstraße.
It is a walk up (no elevator) but wide stairs. It did get a bit hot in the flat, but the fan in the space helped circulate air. The washing machine in the unit was great for us!
Overall, greatly recommend this space as it is the center and walking distance to everything!