Beautiful location with stained glass ceilings in every room, wooden floors and a nice home cinema installation in the exhibition space bordering the apartment. The place itself is very quiet, I did not hear any neighbours, traffic or other "city" noises.
There are plenty of cafes, restaurants and parks in the area (Pieter helpfully sent a list of suggestions) and there is public transport and a bike rental station nearby (it's a 10-15 minute bike ride to the city centre). There is also a small courtyard, with a covered section which seemed very nice (it was a bit cold during our stay, so couldn't try it out unfortunately).
Pieter was very kind and laid back, stocked the fridge with some drinks and made sure we had sufficient granola/yoghurt/fruit for our breakfast.
All in all a great place to stay which I can definitely recommend.