Kasey's apartment is great. It's spacious and the garden is a nice place to relax after a day in Manhattan or exploring.
The subway station is only a ten minute walk, which then has quick and easy access to Dumbo, Manhattan and even Coney Island. There are some great places to eat and drink, as well as some stores, all within easy walking distance. Prospect park is also only a mile away.
We stayed here as a couple with two kids (4 and 7) and would be more than happy to stay again.
Parents of younger children may need to be wary of the secondary spiral staircase, as it worried us slightly when the kids were upstairs, but if you keep that in mind you'll find this place a fantastic stay and Kasey a brilliant and communicative host.