Wonderful, just perfect.
The apartment is, as others have said, even nicer than in the pictures: lovely and airy, spacious, spotlessly clean, comfy bed and has everything you need in the kitchen.
Although we didn't meet, Bernd and Katja went above and beyond to make us feel welcome in their fabulous city, and even contacted us while they were on holiday to make sure all was fine. Marcel met us at the apartment and was also super helpful.
Brilliant local transport within 5-min walk, the M1 tram is great!
I would totally recommend, a perfect location for foodies.