The Casita is awesome: Perfect location, nice equipment (huge TV, surround sound system etc.), own garage... For 2 people it would be really spacious, although for 4 people with 4 suitcases it's a little tight, with the couch pulled out. If you want to stay there with not-so-close friends, you should also know that the wall to the bathroom is more or less transparent.
Altogether, we really enjoyed our stay and would definitely come back! Thanks, Scott!