We were with a group of 11 friends and had a great stay in empuriabrava. The size of the house is to my opinion perfect for 12 guests, because if you're with 14 guests two have to sleep on the sofa.
The house is very spacious, the kitchen has all the tools you need and the pool is great.
Josephina was a very kind host, who gave us all the information we needed and was very approachable.