both candil and costalunga are considerably better than rat traps...and off season shouldnt run you more than around 30-35.
candil at least has a pretty courtyard with pool. and if you have more than a couple of hours...the stroll to the beach and calle duarte is only 2 blocks away. IF you are looking for something dirt cheep for a night..they are available as well.
there are cheaper places...i kept on hearing about el pinos the last trip i was there.