Spanish teacher looking for an English teacher.

Hi there. I need very much to improve my English. I have a C1 level and preparing for C2, so I am looking for a serious and committed partner who knows a lot about their mother language. I'd like to meet once or twice a week and do some written homework also every week. 
In exchange I offer my experience and knowledge to help him/her with their Spanish. ¡Muchas gracias!