Hello Carlos,
Don't know of any houses for rent in or near Gonzaga, but it seems that there are several places to stay and/or camp. Alfonsina's is a place where you can rent a room.
http://www.alfonsinasresort.mx/
The web site doesn't seem to be working well, but does have their contact information.
According to the "Baja Catch", there are numerous places to camp in and around Bahia Gonzaga. If you don't have this book, I recommend you pick it up. It is THE Baja Bible. If not, I'm sure you can drive down and ask around for the best place to camp. Good luck on your trip! Can't wait for you to post the report!