This place is a great catch!
Location is prefect. Flat is by the Cathedral by the old town Square. The location is central yet quite. The flat is close to all the sightseeing points within walking distance. You generally cannot hear the bells every hour from the clocks around the square. However due to the fact that it's an old building, do not expect any elevators. Our flat was located on the 2nd floor, luckily we had some light luggages. Flat was clean and the self check in was convinent.
I think there were some communications problems, probably due the language barrier and made the check in process slightly complicated, but got resolved easy enough.
Overall its definitely a good stay and I'd recommend anyone to book it.