We had a great stay in Flip's apartment! The location is amazing, close to canals, shops, groceries and lots of cool little restaurants. It is an easy walk to any of the tourist stuff you might want to see while there and reasonably close to the train station.
On the slightly negative side the unit could have used a bit better cleaning before we arrived, something easy to fix for the future. And the entry stairs are pretty gross, the building owner made the unfortunate choice of dark blue for the carpet color and along with making the stairway seem darker (even in daylight) it shows up every little piece of lint and hair.
Those items aside, the unit was tidy and neat, has lots of light and the balcony is a super plus. We stayed four nights and were very comfortable during our stay, although definitely hauling luggage up those stairs is no joke! :-) For the record, we found out that most staircases in Amsterdam are just like that one, or worse. So it's not just the case of a particularly cruel architect or sadistic builder.
Given the location, the balcony and the relative value of Flip's apartment we would be very likely to stay there again on a return trip to Amsterdam.