The apartment is great. It's exactly as described: a studio apartment on the main floor of a house in South Slope. It has a main queen-size bed and a sofa that doubles as a queen-sized pull-out bed. The space is a bit cramped with the sofa bed pulled out, but what can you expect from a studio! The kitchen is great - we alternated between eating out and cooking at home some evenings, they've thought of all of the things you could need for a proper kitchen. The check-in process was smooth - we got the combo for the two doors before we arrived and were able to get in without any problems. The location is great - the block is a little less charming than some other south slope streets (there's a big self-storage place across the road) but it's still quaint, and as soon as you cross 4th ave, you get that tree-lined Brooklyn feeling really quickly. The Prospect Ave subway station is on the same block - you can catch the R train from there which is just a few stops from Atlantic Terminal, so you're good to get around anywhere. It's an easy walk to restaurants and bars in South Slope or Sunset Park - just walk up or down 4th or 5th avenue and you'll have tons to do. It's also a pretty easy walk to Prospect Park.
The laundry wasn't working when we arrived, but Gustavo sent us a heads up ahead of time and set up an account at the Clean-Rite on 4th so we could use their wash and fold service. We didn't end up using it, but it was a nice gesture in spite of the inconvenience.
Overall it's a great place to stay - we'd definitely stay again.