Wouter answered to my request very quick and was in touch in any questions. He is very nice and frendly - helped us with luggage (no lift there!), told about area, gave some advices about nearest cafe, shops, bike rentals etc. and also presented one bottle of wine, as "welcome", thanks!
The flat is not in center, but quite near: to Central Station is about 40 minutes by foot, to main places it takes from 10 till 20 minutes. We prefer walking, but you can use tram, the station is near.
Very quiet neighborhood and nice market 5 minutes away from flat with fresh fruits, vegetables and flowers!
This flat is better for short stay, cos there are not enough place for your things and clothes (Wouter usually lives here, so there are many his things, of course). But all was really clean and kitchen is well equipment, if you like cooking.
Two notes - there is a small dragon, he is really quiet, but I felt some specific smell from it (not bad, just specific). And it was a little cold for me, I think because of windows (big and quite old), but this is usual problem for Europe in spring.
So, it was nice time in Amsterdam, thanks!