I really can't say enough good things about Reinout's place and himself.
1) The location is amazing. 5-10 min walking to Beurs van Berlage where my conference located and to the central train station. The house itself is located at the end of a small alley (Oude Braak street), which is connected to a very busy main street. It is rare to find such an unique place which balances so well between convenience and privacy.
2) My room is very cozy, warm, and clean, with a very comfortable bed. No complains at all.
3) Reinout is indeed a very experienced super host. He offered me home-made breakfast and drinking his freshly-squeezed orange juice first thing in the morning is something related to pleasant warm human interactions you simply can't get from staying in a hotel, no matter how luxurious the hotel is. He even let me borrow his only coat..
3) The only thing I can think of surprised me a little upon my arrival is that the stairways is different from the ones in the USA. In Amsterdam, the houses tend to be much taller and narrower, therefore the stairways are steeper. I get used to it very quickly. If you have no knee or legs issue, this should not be a problem.
Bottom line, I would definitely stay here again next time back to visit Amsterdam.