Veni‘s apartment is very close to the West Hauptbahnhof and the FlixBus station, it's about 4 mins by walk, where you can take bus to the airport. Access U3/U6 and trams easily, too.
The apartment is cozy and super clean, exactly as what you see on Veni‘s page.
Veni and her husband are both nice, they helped me settled down and figured out the location of Lidl, and always response in seconds.