We stayed one night on a layover.

Alex was friendly and easy to get in touch with. He waited for us at the apartment, talked us through various things such as using the shower, the keys, and other things, and left us to explore the city. As we were in Amsterdam for only one night, we didn't need to get in touch with him a lot, but for those few times that we had to talk to him, he promptly responded by text.

In general, the room was comfortable. The bed was great, and, although we didn't need to use it, it was good to know that we had access to a mini-fridge.

Our only concern was the bathroom. The toilet seat was located so high that it wasn't very comfortable to use. My girlfriend's feet, for instance, could not reach the floor when she was sitting down. We didn't mind this problem too much because we stayed at the room for such a short amount of time, but someone who stays there longer might find the toilet to cause them more discomfort.

So, while I would recommend this place for a short visit to Amsterdam, I don't know if one would find it comfortable to deal with the bathroom on a longer trip.