Nate and Steffi's apartment was perfect for a month in the summer while commuting to Manhattan for work. I loved living in their apartment, which truly felt like a home. The apartment building has a gym and laundry room as well. Neither Nate nor Steffi were there for the majority of the time that I visited so I had the space to myself.
Taking the J was really easy to get to work in FiDi on weekdays, the only challenge was when the train skipped the nearest station on weekends, in which case the best option is to walk ~20 minutes to another station in order to reach Manhattan.
Overall I really enjoyed my stay and would recommend staying with Steffi and Nate. I was able to meet them at the end of my stay and they were extremely friendly - you can tell they really enjoy traveling and hosting, which can be rare to find in a city like New York!