We had a great stay in Heidi's apartment. Her son met us immediately upon arrival and we had no trouble finding the place.
The apartment is very central in the museum quarter, walking distance to some really nice museums and to the town center. It's a great location!
The apartment was very clean, the kitchen had everything we needed as we like to cook, and the bathroom was great.
Heidi was super responsive and helped get us a fan as there was a heatwave during our visit.
I definitely recommend this apartment!