The apartment is exactly as advertised which is great. Good location, right beside the river with some lovely cafes, bars and restaurants next to it (Boulangerie directly opposite is lovely for a chilled coffee and cake). It is also very central, 5 mins walk from the nearest metro station and two metro stops from the centre. If you don't mind you can easily take a nice walk to Tivoli and the main square in 20 mins.
Andreas is a good host who responds quickly to requests and is flexible with check in and check out.
Only thing I would say is if you have young kids or any health issues the stairs could be an issue but apart from that I would highly recommend.