I went for 2 weeks, to combine tourist purposes with something useful.
Specifically, this school does not look like something useful for learning the language (it is clear that 2 weeks will not be useful anywhere)
From the pros:
In general, the atmosphere is friendly and hospitable
Teachers are also quite adequate and interesting
The opportunity to find a company, speakers of other languages, who learn English and practice with them (I think this is the main benefit of the school, it may be worth taking a few weeks to find a company, and then learns on its own)
From the conclusions: if you are going to go, it is better to take morning classes (they are a bit more expensive) and from the first lesson to try to find a company for extra practice.