Ellis is an excellent host, funny and will give you lots of suggestions if you need some. He welcomed us and took the time to show us how to properly close the door of the house and answer any questions we had upon our arrival.
He is also very helpful and will accommodate your needs the best he can. For example we had to check out of his Airbnb during the day but our flight was very late at night, and Ellis was very kind enough to let us keep our luggages at his place until it was time for us to go to the airport so we didn't have to walk around the city with our bags. It was a very thoughtful gesture and we really appreciated that.
The location is great with easy access to the R line that brings you directly to the city. Park Slope is a very quiet neighbourhood with plenty of useful supermarkets and shops around which made our visit in NYC very pleasant.
Quick note: sleeping in a basement is not for everybody so make sure you're comfortable with that before booking.
Overall we had a great stay with no issues at all.