Thanks for your suggestions!
I already asked them to come over and they're gonna do it one day i suppose.
I send them gifts, give them money, say thank you, get gifts in England for them and stuff.
For me it's not about gifts or money.
I think there's another problem. It's a problem with myself. I know that I did everything in order to show them that I appreciate their kindness and that they let me stay at their house. HOWEVER it's a weird feeling for me, that "people" ("strangers" if you like) pay everything, literally everything! It gives me a feeling of dependence and I feel like a child as well. Especially because I am a stranger to them and I am in a foreign country (even though I love it
But I think we already discussed that. (To be honest I can't remember).
Anyway, thank you everyone!!