Older American with moderate Spanish knowledge,. not enough practice,  needing review. Serious linguist with about four other languages in varying degrees of fluency. Taught English at college level so proficient in language learning methodology and tricks.
What I am not looking for is a school with post high school students here on a lark. One where professionals brush up would be good. It would also be preferable to have short term courses which can be taker intermittently.  I have looked into the University courses, which seem a bit pricey but are probably quite good. I would appreciate other suggestions.