Hi, for all those based in Madrid who want to take regular Spanish lessons but don't have a lot of money - this school is for you.
William's School on Calle San Andrés 25 (Metro Bilbao) offer 4 hours a week for just 28 Euros per month (4 weeks). If you would like 1 and a half hours daily the cost is 68 Euros.
They also offer language classes in French, German, Italian, Japonese, Russian, Chinese, Portuguese and of course English.
I don't have a web-site for this school but the telephone is 91 448 33 04. As far as I am aware all their teachers are native speakers of the relevant languages.