We felt very at home at Crystal's place. The apartment was clean and comfy without being too small. The station for the L and M lines is just a couple of minutes away - both take you directly to Manhattan. Although you can see the subway (and also hear it when the window is open) , it's not very noticeable.
When we arrived at the apartment, it was super hot inside. Crystal had already sent us a message about the heat issue. The AC in the guest room was running but unfortunately it's pretty loud. So we just slept with the window open and that was totally fine. We were honestly surprised how quiet it was on the street during the night - even though there's a gas station right across the street. So don't worry about that.