I'll start by saying that Mart is a great person in addition to being a great host.
He shared his food, wine, and knowledge with me just like a good friend would.
The location is great, you are nearby some of the major tourist attractions, supermarkets, restaurants, bars, public transportation and the flat itself is quiet and cozy so you can get a good night's sleep.
If you are planning to stay in Amsterdam I highly recommend considering Mart's place.