communication: Linus easily responds to all our inquiries. he also gave us some suggestions regarding where to shop/eat.
house: cozy, quiet, and perfect for family. we didn't encounter any problem with getting up to its floor (4th) since the building does have a lift. very near to tram stations, thus you can easily get around amsterdam. he even helped us in booking a cab going to and from his house.
since its a proper family home, expect that the things inside had been used before (minor glitch with the microwave but fixable, besides, i just used it for warming baby food. i bet you'll be going to restaurants anyway to try authentic dutch food :))
other than that, the place is really just right for our trip with my husband, and our 1 year old daughter.. additional extras that my daughter loved was their family piano, and the small playground just in front of the apartment.
it's a home away from home... we'll definitely go there again on our next trip to amsterdam! :)