That was a very nice experience to stay in Yelena's apartment. It's close to subway and Central Park, pretty big (I was alone, so it's perfect for one-two people)
Everything works just fine, Yelena's father showed me how to lock doors and use washing machine etc. the apt is on the first floor, so b/c of closed blinds there is not a lot of light. Still, if you need a place to sleep in ot hide from overwhelming NYC, it's the right one.
I would recommend staying at Yelena's place.