If you want to be right in the center of all that's hapening on Calle 13, within walking distance to the many TD Bar's, restaurants and Taco Shacks, and just a two or three block walk to the beach.
Well, then the "Hotel Playa Azul" may be of interest to you. A block to the east is the "Seniorial Hotel" w/off-track betting and Chinese Dining. Do an about-face and back track to the west and in between Playa Azul and what was once called the Plaza los Glorious, there is a four or five story hotel and again I'm at a loss for the name of this one as well, but I do believe it is a lower priced basic room like the Seniorial and Playa Azul.
There are a few more, like the little one next to the El Sombrero Taco Shack. There are also rooms above Keno's Market, and if you look up and down the streets that cross Calle 13 there are many many more little hotel-no-tell type places. Sorry I can't give you a review on any of these fine establishments, but I can tell you there are countless rooms around your area of interest.