The house is nice, clean, and certainly big enough for a group of 10. The backyard is well-kept. There's a gas grill and a large picnic table and chairs for outdoor bbq with your group. The backyard is shared with another tenant who stays in the separate studio in the same house. We saw them once when we were staying there when they were getting out. It might be awkward if the other tenant also wants to use the backyard.
There is only one big TV in the living room but none in any bedroom. It would have been great if there was a TV in at least one of the rooms so the kids could watch TV or play games (our kids brought their own Xbox with them) together without "fighting" over the main TV in the living room with the adults.
All in all, everyone had a good time. Mark or Vitor was always quick to respond to any queries you may have over text or email. We'll stay there again next time we visit San Diego with a group.