I had a great stay at Kees & Marjoleins apartment. Although they made a mistake in the reservation, but in an hour my room was ready and they offered me to stay another night for free. I really liked that.
The apartment was a bit smaller than I thought. But the big green garden makes up for thay. And there aren't any necessities you'll miss during your stay, really.
I know the neighbourhood very well and it offers a lot fun bars and clubs to visit. It's really close to the city center (just take the 5min ride on tram line 4 and you're at Rotterdam central staton).