I stayed at Parwana's place to be close to the ZOB and Tegel airport. It was great for those purposes. Besides that, it was close to Charlottenburg, which is beautiful and a nice evening stroll away. There are a lot of supermarkets down the road, and a bunch of restaurants nearby. All in all, a very convenient location. Check-in and -out was smooth as per instructions. I didn't meet Parwana, but had no problems reaching her, and found everything easy and convenient. Would recommend this place!
The only potential drawback could be from other guests; while I stayed there, there were other people who arrived a lot later and took showers even after midnight. With the bathroom being right next to my room, and me being a light sleeper (and in bed early due to having to get up at 5am), this wasn't ideal. But then again, that could happen anywhere really. Apart from that, it was a very quiet location.