We booked the apartment for 4 days and had a good stay overall. The biggest advantage of this apartment is definitely the location, which is perfect. You can walk to everything and be in the old part of town in 10 minutes or at a tram station in 2 minutes. The host welcomed us personally and was very nice and helpful. He gave us lots of tips and the apartment even had a book with addresses and places to visit.
Unfortunately, the apartment also has some disadvantages. Firstly, it is very noisy, so you can hear everything that happens on the street. Also, the neighbour above the flat is very loud and you hear all the footsteps. A second disadvantage is that the flat has only one small window at the door, which makes it very dark and humid. You can smell and see some of the humidity. For example, my girlfriend hung her suede jacket on a bar next to the wall, which was then completely soaked on the wall side (with suede, wetness is very bad, so that stains appeared). This was of course very frustrating.
Overall, however, it is a cute flat that is well suited for a short trip.