Petras flat is a great place to stay. It is well equipped, clean and tidy. The location is also great - shops are only five minutes away and the center of town is easily within walking distance through the park opposite the flat.
Due to horrendous traffic we did not get to see Petra as planned but she organized the handover of keys with a friendly neighbor that worked flawlessly - many thanks!
Communication with Petra was excellent and kind. Lots of tips about the flat and area.
My only criticism would be the sofa-bed in the rear room - it is very hard and my son had a few uncomfortable nights sleep in it.