I had a great stay at Mina's place. I was there for a little over three weeks and I wish I could have stayed longer. It was very clean and comfortable and although it wasn't very close to downtown, the neighborhood was super cute and the nearby Schafersee was so nice to go on walks around :D and there is a train station only about a four minute walk away that goes right to Alexanderplatz.
I would recommend bringing earbuds for sleeping as the walls are pretty thin and some of the other guests were loud pretty late but it wasn't an issue for me.