Loved our stay at Ruud's place. The room in the attic was very comfortable, private and clean, with a great view (and a terrace!).
Location is absolutely perfect to explore Amsterdam on foot as it's close to EVERYTHING, without being tourist-ey. The neighbourhood is very trendy, with tons of food options.
The use of space is very creative (the mezzanine bed is pretty cool), adding to the "proper Dutch" experience. I would say that if you are very tall or large in size you might find the room, the stairs and bathroom a bit awkward (I'm 186cm and average build and I was fine).