I took the Russian Standard Course in 2015 e this year, just a week, because my job in Italy, and in both of them weeks, my Russian language improved.
Teachers are much prepared and during the lessons you learn writing, reading, speaking and listening Russian in an intensive mode. In case you don’t understand something, they will explain you in English too. Farthermore they will give you homeworks, so that after the lessons you can think on. I was in a homestay and I can pratice Russian with the family. The best way to pratice that you have learned is outside from the school.
I reccomend this school for people that want learn Russian, also only with basic knowledge of the language.