Marta and Eugenia in the Arcadia Center were great! Eugenia found amazing homestays for everyone! Compared to other programs who send students to the CLM, I liked that Arcadia had less strict policies on attending group events/classes -- some programs you could not skip any classes. They also arranged fun optional group excursions for us.
Unfortunately, there is a required Arcadia class that was in its first year when I was there, and it was taught in English. If you're hoping to take all of your classes in Spanish, this is a disappointment. It was also a point of contention between students and staff, as the teacher did not seem well-versed in the subject matter.
I completely recommend doing a homestay! Everyone loved their host families