Williamsburg is a perfect location! And Christina's place is perfectly located even in Williamsburg. Close to L subway train which turned out to be very strategic - just one stop to Manhattan and goes frequently (G train which also crosses Williamsburg is much less useful). At the same time, there are many good pubs, coffee shops and other places of traveller's interest in the very neigborhood. You could hardly find a better location in NYC to stay.
The room itself is cozy, and well, it's a bedroom, not much else. It was fine for us, though. The kitchen and bathroom were also fine and clean.
Christina is a very nice host. She replied instantly to all questions and helped us with everything. We had no problem with late departure.