This is a fantastic apartment - I highly recommend it to everyone. The kitchen and living room are really large, the living room has the most incredible view. The bedrooms are very generous and comfortable, and quiet.
We were able to walk everywhere of interest very easily, plenty of restaurants and shops nearby, though the street/canal and house are actually very quiet. For me this apartment is in the perfect location for a really enjoyable break in Amsterdam.
Roman is a very gracious host; we didn't need to have much contact with him beyond check in, but we felt very comfortable and welcome.