We stayed at Rene and Ellen's house for 3 night Feb 2019.
The place was outstanding. Spacious, clean and stylish.
Rene met us at the door. He quickly explained how to travel into the city and recommended local restaurants and shops.
The "apartment" is the bottom level of their own house, with private access through the back yard. This was secure and private. The place is actually bigger than what the photos suggest. It was very comfortable. The bed was large and very comfortable.
The location is good, although it takes a little time getting into Amsterdam city. There a few options: bus & train (3.20 euros); walk & train (3.20 euros) ; walk & (free) ferry; Uber (10-12 euros). We tried all methods.
Communication from Rene and Ellen was excellent and response was quick.
I'd definitely recommend this place for visitors to Amsterdam