I stayed at Effie's apartment for one month, when I first arrived in New York for work. She is Petya's aunt.
The location is great : the subway is right on the corner of the street. Many different lines will bring you to Manhattan (in less than 20 minutes) or Brooklyn. There are also several buses. The counterpart is that you hear the aerial metro all night long - it can be bothering for light sleepers. All the necessary shops are a few blocks down and the neighborhood is lively and secure.
One third of the living room has been converted into the bedroom you rent. It is separated by two cupboards and a screen. Effie does her best not to use the living room when you are here but you will not have much intimacy. There is a single bed and enough furniture to put all your clothes in.
Be aware that you are only allowed to do "light cooking" such as boiling pasta and vegetables or making sandwiches. For one whole month, it was not very convenient.
The ad mentions there is a washing machine : there is a laundry in the building but you will have to buy a card (5$), detergent, and add a few dollars for the washing and drying of your clothes. I had to wash my own bedsheets and towels, which I found quite surprising.
It was overall a nice stay but one month seems quite long when you cannot cook or sleep in a real room, and there are many rules to follow. Effie is nice and gives good advice since she's been living in New York for quite a while.