The apartment has a perfect location, we've managed to visit pretty much every neighbourhood, museum and park on foot. Most of the see worthy locations are within a 30 minute walk.
The building itself is quite nice as well, very high ceilings and a sunny (shared) roof terrace.
Though, being an old building, it can be quite noisy. Most of the time it was very quiet, but whenever a neighbour walks around you can hear it rather clearly.
We initially had some WiFi problems, but thanks to a back-up network this was mostly solved.
The host always responded quickly and helpfully.