We were very happy we chose this flat for our stay, and would happily stay again.
The location was excellent, allowing us to walk to all the sights we wanted to see, or to the river for it's exercise trail, in 15 minutes or less. The square on which the flat looks out was a constant source of entertainment: in a week, we saw a protest for better healthcare, part of a marathon, a marching band, and of course all the people watching we wanted. The flat has a narrow, long layout, so that the front room gets all the light and some noise from the square, but the bedroom in the back was dark and quiet, so perfect for sleeping.
The kitchen was outfitted with plenty of tools for cooking, and even had not just oil, salt, and vinegar, but also a number of spices and herbs. They also had nice cutlery, glassware, and plates to make your meals a little more fancy. :)
The wifi was very strong in the living room and kitchen, easily good enough for video calls. However, in the bedroom and bathroom areas, the signal was very weak.
One of the water heaters was broken when we were there, so we could not use the tub. If this is important to you, then check with the host before reserving.
Note that the second bedroom is more like a second living room. It does not have doors that separate it from the other bedroom, so there would be little privacy and you must walk through it to reach the bathroom or main bed. Because of this, I would highly recommend this flat for a single, couple, or family with small kids, but it wouldn't be ideal for two couples.
The host made check-in fast and simple, and was responsive to our questions.