I AM LOOKING FOR A HOST FAMILY

I am a native English speaker form the UK. I am currently working in Llinars Del Valles near Barcelona as an English Teaching Assistant. I was wondering if it would be possible to live with a host family near the centre of Barcelona until July 2019 in exchange for teaching the family English, babysitting, pet sitting etc. I am a very quiet, polite and respectful woman.  I have experience with children and animals and I would like the opportunity to live with a host family to experience Spanish family life and the different cultures and lifestyle that Barcelona has to offer. Thank you in advance.