Marina has multiple apartments, so it's hard to judge what you're getting based on the pictures shown.
The location was good: blocks from Grand Central Station near Park Ave. A very good base for exploring NYC and near to most subway lines.
The apartment my 2 friends and I stayed in was not pictured at any of Marina's three locations. The space was very cluttered, all kitchen counter tops were covered with food boxes and kitchen appliances. We didn't cook so it didn't matter, but don't plan on cooking. There was a full/queen bed, a futon, and a sofa - enough for 4 adults if you're not picky. Water pressure and temperature were fantastic. Bathroom was very cluttered as was entrance hall. There was also a projector hooked up to a laptop so you can watch streaming video if you want. The space worked for us because we just needed a central location to sleep and shower in.
The doorman took our names down when we entered the first time. Other times when we came and went the doormen questioned us. A bit awkward, so make sure you're prepared for them.
The address is not included in the information given on Airbnb so when the reservation is booked so make sure your first question/message is for the address as well as the times when you will meet Marina to pick up the key and also when to give the key back. Marina was very good about meeting us at times we chose, even though it was outside of the initial check-in time. At the same time, it took a little waiting to hear back about when we would meet up, so better if you set that early on, when the reservation is made.
Overall: satisfied because the location was most important to us. Good for a weekend trip.