Free English classes for free Spanish classes

Hi, I am looking for someone who would be interested in taking free English classes in return for free Spanish classes. I am not looking for someone to have a chat with or to go out with but for real classes. My Spanish is very basic. I have five years of experience in teching English, living abroad for many years. I am from Prague so if you are strictly looking for a native speaker do not waste your time in answering. Many thanks, Lucie