How to identify if a gym is good?

I want to go back to doing Muay Thai (I’m not a professional and I’m VERY far from it), I used to train at a gym that seemed to be good (that must have been a year ago), but I found a new one that would allow me to do more modalities, and I wanted to know how I could identify if the gym is good or bad (I’m not from Thailand or the United States, I’m Brazilian so know that maybe you guys say certain things that are almost impossible to find here in gyms)