Mark is a great host. Our experience right after we landed (and we landed way before our check-in) till we checked out was top notch. Mark helped us with our bags in his own living space until our room was ready to check-in. He even helped us with spare umbrella as it rained a lot during our stay. His books and newspaper articles for reference to experience the city helped us gain some new perspective of the city (we would have never visited Green-Wood cemetery otherwise).
The space is clean and comfortable and has easy access to anywhere in New York/Brooklyn as Carroll St for local is 5min walk from his place. Overall, I would highly recommend his place.