Petra's flat is located a bit away from the city center which some might not like, but which allows you to enjoy a quiet neighborhood. I don't think it's feasible to walk to the center but the tram is very convenient and is just 5 min from the flat (2 lines so you have more than 1 option).
The flat is well equiped, nicely decorated, and the living room gets tons of light in the afternoon/early evening which is particularly nice. It has plants and I even found fresh flowers in the living room!
Communication with Petra is very easy, and she even waited for me outside the building on my arrival evening which was very kind.
Overall, definitely recommanded!