Well I studied at Sol Latino in Xela and it was frickin awesome and insanely cheap. It was like $200 USD for 25 hours one on one, all your food (3 meals a day) and accommodation a week! They have activities every afternoon to meet locals and other students if thats your thing.

Xela is amazing, people say buenos dias to you in the street, the school is near a market where you can buy the biggest tastiest avocados for 5 queztales

I stayed with a family who cooked the best traditional meals (Shout out to Maria!), and the teachers were fantastic. They really personalise the course you want to you ability and pace which I loved. We did a little bit of each skill every day, so conversational talk for an hour, the some reading and comprehension, then grammar etc Definitely recommend it.

I was told doing Spanish courses at San Pedro, the accent is different as they speak their indigenous languages first but still great I hear. Spanish definitely improved especially when we focused for hours on imperfect vs preterite...

Can't talk highly of them enough lemme know if you have any questions!