We enjoyed staying at William's place and would recommend staying there. We liked having the whole apartment to ourselves, and the apartment had high ceilings and big windows that allowed for a lot of sunlight, which gave the place a very open feel. William decorated with a lot of plants which was a great touch.
We also liked the location of the apartment. There are a few restaurants and coffee shops that are about a 10 minute walk away, including a very cute coffee shop just across the street. There is also a great park that is just under a mile away. The apartment is located on the third floor, and there is an elevator. The street is mostly apartments so it is pretty quiet. You are in NY, so there is noise every now and then, but it was nothing we couldn't sleep through, and we are fairly light sleepers. I think over a week stay, the loudest thing we heard was the garbage truck picking up trash one morning.
Check-in was very easy. William's directions are very straightforward, and he was pretty good about responding and making sure we had all the information. The place could have been a bit cleaner. I think the cleaner missed a few spots here and there. We told William soon after arriving, and he was very apologetic. I doubt it would happen again in the future. There is laundry in the building, but it is in the basement, and it is shady down there, but not unsafe. Also, I am not sure if William provides a laundry card, but we didn't see one, so we had to pay $5 for laundry card, then had to put money on it. Still, it was way more convenient than having to take the laundry across the street.
Lastly, you are about a 5 minute walk to the G train, which can take you to a lot of places in Brooklyn! I did take the bus 1 or 2 times, and those stops were about a 7 minute walk away.
We do recommend giving William's place a try. It's perfect for a couple or even for a small group of people. You have a lot of space, so you don't feel on top of each other, and it is in a great location!