You basically book this place for it's location. I booked it to see the tower, it is literally 10-15 mins walk. The area is safe and quiet, even though we stayed during the weekend. The place is very clean and provides all the basics, including micro-kitchen, etc. It is located in a quiet backstreet. This is a redesigned store or another business, I guess. Originally it was not a flat. Main bed and bathroom are in the basement.
It has certain limitations, unfortunately. First, the smell in the basement, which is your bedroom. It was not unbearable, but noticeable for everyone and definitely not pleasant. Sewer dampness or something like that. Second - I am too tall for the bathroom (195cm) and had to bend :) Third - check-in is basically wading through a kind of backyard place between trashcans and other stuff to find lockers with keys etc.
We stayed 2 nights to see the tower. Ok for that. 2 adults and a 6yo.