We loved our staying in Petra's apartment! It's nice and extremely cozy, just on the top of the building, so there's a sweet view from the window. Petra was very welcoming and friendly, we had everything we needed. The apartment is situated in the nice and quite area. There are good cafés, big flea market, several supermarkets and bike rental stores in the area.
All in all I strongly recommend Petra's apartment for staying in Amsterdam!