I stayed for one night at Casa Vrolik, too bad it was just the one night because I loved the place. Toetsie was very welcoming and her cat is so cute!
The room was light and airy, slept like a rose (after some drinks at Cafe Bukowski, ;)).
The house is full of books, music, plants and good vibes. So therefore I would recommend it to everybody who wants a very special place to stay in Amsterdam (I am already planning my next stay as wel speak, haha!).