My fiance and I stayed for three nights at Katja's apartment, and we had a great experience. Definitely do your research though if staying over a weekend as sometimes the L or 3 trains might not be running, but during the week you'll get into Manhattan in about 40 minutes. The apartment was very spacious for the two of us, bright and clean. The neighbourhood is very residential and quiet, it's worth going just around the corner to the local deli for a quick breakfast before heading into Manhattan. Katja is also just downstairs and is available if you should have any questions, she and her family are very lovely! Would definitely recommend!