To summarise - we found no problems with Vadim's apartment, in fact we found it good value for money.
When we arrived Vadim greeted us in the lobby at the bottom of the apartments, and then showed us around the apartment block as there's a rooftop, lounge and gym which available to use for free.
When going through the apartment with Vadim he pretty much showed us how to use everything, and was very thorough.
Vadim also went through a bunch of places to get food (Astoria is known for its restaurants) and gave us a recommended list, which I'd agree are some of the best in the local vicinity.
The apartment contains a good sized bedroom with a large amount of storage for clothes. The washer, drier, bath/shower, dish washer and kitchen were all very clean when we arrived. There is also little to no clutter within the apartment which we liked. There's an Smart TV and a pretty comfy couch which overlooks Manhattan, with a small balcony.
The view from the roof at night is spectacular, we went up so much that we took it for granted. The local subway is a 10 minute walk straight down a single road to the Broadway stop, which will take you to Manhattan and Brooklyn.
The lobby below the apartments has a guard, and the door to the apartment has two locks, ensuring good security for who are worried about safety (usually is if it's your first time staying in the US).
Astoria is slightly cheaper than Manhattan and we're glad we stayed here as Manhattan can be crazy busy at times, and the locals are pretty friendly.
I'd definitely recommend this to anyone and would stay here again, no doubt.