We stayed in Ken's apartment with our 2 boys 14 and 16 for a week. Location is brilliant. 10 mins walk to Central Park/museums and subway, 2 mins walk to bus stop - bus every few mins to midtown and downtown. Great cafe on corner for breakfast, loads of restaurants.
Ken is a lovely host, very helpful, telling us to help ourselves to food from cupboards and fridge. The apartment is very much his home and quite crowded with his belongings. The linen is quite old and tatty but basically clean, likewise the kitchen. There is some occasional noise from people walking in the apartment above. The shower works great though so if you're happy with fairly basic accommodation this apartment is a bargain for the location.