We had a great time in Grover's apartment! The description on the site is quite accurate. The bedrooms are downstairs, so not on the same level as the living room (one of them is below ground level, with a small window in the corner). Lyndon welcomed us instead of Grover. He is an enthousiastic guy who explains all about the apartment. Wifi was working fine during our stay. The bedrooms were big and comfortable. There are a lot of extras like towels, ironing board, washing machine available.
The neighbourhood is nice. Normally you would not visit Harlem when you visit New York, but is a very pleasant area, full of life. The bakery at the corner (Lennox saphire) sells very nice bread. The subway station is 5 minutes walk.
Thanks!!