Joost was very kind and helpful for any info we needed, so the neighbours. The Vondelpark area is very quiet, close to the park, but far from the centre. You can take the tram nr. 2 to go to the centre. The tram and bus stop is near the flat. The flat was clean, unfortunately it's for three people, basically...we were four and there was a mattress that you can put on the floor or on the sofa. Not so comfortable, but nothing so horrible.
In spite of allergies and fears, Rocco, the cat, was very nice and quiet.