I stayed at Mart's house while attending a conference at the nearby Theatre Amsterdam.
The room is an airy, spacious loft conversion on the third floor of a residential block. It has good views, with a comfortable double bed and wardrobe (that you share with the hosts clothing) and a Wickerchair to sit in.
The property is around 25 mins walk from Amsterdam Centraal Station, and placed in a residential area of West Amsterdam. There are local shops and restaurants nearby.
If you're uncomfortable with stairs, then be aware that Mart's place is on the third floor up a very narrow set of stairs. The room itself is up a set of ladders/narrow steps into the loft - this can be a little precarious at times.
Mart's friend Apollo kindly met me at the property to let me in and show me around. I was also grateful he carried my suitcase up the stairs and into my room.
There is a small bathroom with a shower, and kitchen area that you can only get to via Mart's living area. This did make me feel as though I was disturbing the hosts when I needed a drink or to visit the bathroom.
There are also some strict house rules to be observed. No shoes inside, and a need to be exceptionally quiet in your room after 11 pm and to be exceptionally quiet when coming up or down the ladders to the room. The host told me this is because the noise of footsteps on the wooden ladders and floor disturbs everyone. This did make me uncomfortable as I was worrying about disturbing Mart and Apollo when I was moving around in my room or needed to go to the bathroom.
If you need to work while at Mart's place, there is a good WiFi signal, although the dining able was out of bounds to guests, so you need to work off the bed in your room.
Mart communicated well before my stay and arranged for a check-in at my convenience.
Overall, this was a beautiful Airbnb in a lovely location. If you are comfortable with the house rules and the location of the room in the loft, then it would be a nice place to stay as you explore Amsterdam.