Way back in the mid-80s we hosted two 16 year old French boys for a summer (We asked for one or 2 girls, but only boys were available). Our daughters were 13 & 14 at the time. One boy was great, while the other was a little spoiled. Nevertheless, we had a good time and our daughters had big brothers for a summer.
In 1989 when our older daughter went away to college, our HS senior daughter decided she wanted an exchange student. She made all of the arrangements and selection and we hosted an 18 year old young man from Sweden for the entire school year. He boasted quite a bit about his homeland, which didn't sit to well with my wife and my daughter. It didn't bother me. In fact, I liked him very much. He was a guitar player (I was just learning at that time) and a good athlete. He integrated well into our HS, played soccer and dated several girls.
All-in-all, these were a good experiences for us. There certainly has to be some give-and-take to make the most of the exchange.
Just last week we received a post card from our Swedish student. We had lost contact over the past 7 or 8 years. We were glad to hear from him and look forward to seeing him again, this time as a 30 year old adult!
Go for it - you'll have a wonderful time!