Olaf is a wonderful host. He gave us great advice on what to see and do and was also very quick to respond on WhatsApp with any questions that we had. Moreover, he was very flexible with our arrival time and also let us keep our luggage in his flat after checkout. He is very considerate and welcoming.
Olaf's flat is also in a great location. It is about a 15minute walk from the museum area. There are also a lot of great restaurants within a five minute walk of his place. The tram lines are also only about a block to two blocks away.
This is definitely a great place to stay! (Also, the beds are very comfy!)