We had a great time at Ali's and Justin's place. They were extremely helpful and responsive beforehand and during our stay, giving perfect directions how to get there. Their apartment is charming and unique, with endless things to look at. And the bed is very comfy.
The cat was not only sweet and very easy to handle but also a great entertainment alternative to a TV. We spent the mornings and late evenings just playing and cuddling with her.
The location is of course excellent, with the east river ferry terminal just a 3-minute-walk away (do it!) and all the hip places in Williamsburg within walking distance.
I would definitely recommend staying there.