My brother, boyfriend and I were at Marijn and Sebastiaan's flat for only a couple nights, but we loved staying there. It was very comfortable and conveniently located, only about a 5-10 minute walk from Amsterdam Centraal train station. Marijn was very warm and helpful, and even suggested going to check out the Open Garden event which allows you to see the gardens of houses along the canals which was really cool and something we wouldn't have known about. I definitely recommend this b&b and would love to come back!