Our stay at Mart's was great and Amsterdam was unbelievably gorgeous!!! Not much to mention other than what another guest has mentioned already (and I didn't notice before booking) that there were a lot of stairs to get to Mart's apartment (4th floor?). And they were steep. I think this is just an Amsterdam thing you need to be aware of though. There isn't much real state in Amsterdam as you might be used to, so buildings are tall and skinny and unless it's a new building it most likely won't have an elevator.
Mart was amazing enough to help us get our luggage up and down the stairs (a month vacation worth of luggage) so that was a HUGE help and made the stairs issue not as big of a deal but it's worth mentioning in case you have some condition that wouldn't allow you to go up and down steep stairs.
It was a lot of help sharing the apartment with a local since Mart gave us tips on how to get around and where to find things but next time I'll probably book an apartment for ourselves only. It's been working better for us as we're a private type of couple.