I can highly recommend staying at Roelant's apartment: it is very spacious and with lots of windows; the dining room made a great office for me during my 7-day 'working holiday', the bed was comfy and had high-quality linens and pillows; the kitchen had everything I needed; wifi was fast and easy to use. Roelant left the place clean, neat and tidy, with plenty of hanging space and drawers in the wardrobe and bathroom shelves clear and ready for my things. Much appreciated.
I really liked the location - in a residential area outside the center, but with so much within a 5 minute walk - an Albert Hein, a bakery across the street, cafes, organic grocery, Etos, and great turkish restaurants (I got take away a couple of times from the place next door). Transport was so easy, with trams and buses getting me to various parts of town in 15-20 minutes.
Communication with Roelant was not only efficient, but a pleasure since he was so friendly and helpful. He had already left on his holiday by my arrival time, so his friend met me to let me in and showed me around. Both were wonderful and sent me texts during my stay to check up and ask if I needed anything.
For me, there are no down-sides to the apartment, but maybe a couple of things to be aware of: there is some street noise, so bring earplugs if you are a light sleeper like me, I used mine and slept soundly each night. Also, like in most places in Amsterdam, there are two flights of steep stairs to reach the apartment. I was traveling with a large and heavy bag and had trouble with the second flight, but Roelant's friend helped me. The stairs will cause no problems for travelers with backpacks, carry-on size bags, or who are used to them. (When I was leaving, I had no problem carrying my big bag down the stairs!)
Overall, a 5-star stay!