Since I am now in Spain and the computer I use has no Chinese input system, I have to write in English.
Well, I´ve spent three days in Salamanca and two days in a language school (Isla) so far. My feeling is, the city and the school are not too bad, but trust me, Granada and the school I attended there (Castila) are still the best.
First of all, Salamanca is full of very young people, many of whom are secondary and university students from Europe and US who come to the city in groups just to study Spanish. The school I attended is a reflection of the city, with the majority of its students, at the moment, being secondary and university students coming from United States, Germany and Norway. The school atmosphere is very much dominated by these student groups who speak in their native languages after class most of the time.
I will write more later about the teaching of the school, and the city itself. But for the moment, a piece of advice for you: if you are not too young, i.e. like me (well, up to you to imagine what is ¨not too young¨), better not come to Salamanca to study Spanish. You will feel that you do not belong here. But if you think you are young (at least at heart), here is the city for you!