We´ve had a great stay in Mark´s house. We were 10 boys and the shower had hot water for all of us.
If you take a bike, you can be in Amsterdam Centraal in about 17 minutes taking the ferry.
We will definitely repeat this experience, the host was very comprehensive and our communication was flawless.
I highly recommend this place, specially for a group of friends who want to enjoy the beautiful city of Amsterdam.