The place is really nice. I recommend it to all people (except those who are not ready to climb the stairs). The stairs btw are typically Dutch so it's no surprise. The flat is pretty big and more than enough for two. The bed is very comfortable. The location is perfect - both for public transport and for having a walk. We did 15 km per day one of the days and felt good. It's great to have a good supermarket right next door. Maaike is very friendly and supportive to her guests.
Have a great time staying at her place! Amsterdam is amazing)