Overall impression over the apartment and host is great, we had no issues with anything starting from arrival to stay and later to check out.
Location: The apartment is in good location, it is 12-17 min walk from the Kursalon. There is metro station, but we have used Uber during our stay (7-12 EUR per trip to all key museums and palaces). There are several supermarkets around.
Apartment it self: clean, equipped with all necessary items (towels, hair drier, dishes, dish washing machine etc.). The design is modern. It was possible to control heat and make it comfortable.