The flat is centrally located, and very close to the metro. The check-in process is a bit convoluted, you need to have data on your phone in order to reach the website needed to unlock the doors. And for some reason the host couldn't accommodate me coming at 9:30 in the morning even though I had paid for the full night prior (luckily he allowed to me alter the reservation, so I stayed at a day hotel until the afternoon).
The room itself is okay, the street it faces is pretty populated well into the night, but that didn't bother me. My main concerns were about the shared bathroom. The door and handle were broken by the time I arrived, so the door could not close or lock. In addition, the other guests would leave the bathroom in a dirty state. I had hoped that housekeeping would clean it regularly, but they didn't in the two days that I was there, so the bathroom felt unusable and unsafe to me. The host had been very communicative with me up until the point that I brought up these concerns, and I ended up leaving my reservation early.
If you're a young woman traveling alone, I'd recommend confirming that the bathroom door/lock has been fixed before booking. One of the other guests also tried peering into my room through the door panels in the middle of the night so I'd keep the curtains pulled shut as well.