Nowadays it seems you can find whatever thing you can imagine on the internet. I don't know why I was thinking about the possibility to accomodate a native English person as a host to make a language exchange and benefit the two parties. 

Guess what, Google brought me some sites surprisingly... Don't you all guys think it is awesome?

Not only the host and the guest can make the language exchange but they can also learn the culture from the other party; of course the guest can visit places of the new city. I think its definitely a super idea.

Now the most important thing is to decide, do you want to be a host or a guest?