We spent 10 nights in the apartment, and we had a great time. Everything was as described - the place was totally clean, and nothing you might need during your stay was missing. Alex even had some things available for us in the fridge when we arrived. The beds were totally comfortable, and we had lots of room.
The neighbourhood is absolutely safe, with nice places only a short walk away (A-C train to JFK and Manhattan, delis, Corner Grind for breakfast, Angela's for dinner, and Sista's Place for Jazz nights).
So, if we will ever be able to come back to Brooklyn, Alex will be the first one to check for another stay at his place.