Firstly, every bit of the description of this listing is accurate. Martin is a great host, who takes a lot of pride in hosting, and only asks that you abide by the rules setup on the listing. He prefers open communication, and expects the guests clean up after themselves especially in the common areas of the apartment.
Apartment is conveniently located with easy access to Williamsburg neighborhood as well as a 20min ride to Manhattan.
One Note: I wasn't sure if it was listed or not but there's no elevator in the building. So expect to climb three floors.
TLDR: great location, host expects privacy and cleanliness, close to Williamsburg, three flight of stairs to climb.