Anna's place is great we were two people and it was more than big enough, though I can't see why anyone would come to New York and want stay in the flat all day anyway.
The location does look a bit "urban" when you arrive (we're from South London, so nothing exceptional for us), but you are 2 mins from the Subway, which has you in the centre of Manhattan in 15 mins and JFK in less than an hour!
The really trendy part of Williamsburg, with all the thrift shops, markets and cool restaurants is no more than a five minute walk from the apartment.
The only potential negative is perversely the flats proximity to the Subway, if you have never to been to New York, the trains are pretty noisy, it didn't bother us, and I'd rather that than be miles from everywhere.
Would definitely book the flat again.