Burlington is a relaxing little city in Iowa. I've been living here a while now and I enjoy the area. It's pretty far from any other big cities so it definitely feels like you're living in the countryside. It's pretty cheap to live here; you can find a nice house for not too much money.
If you're moving here, make sure you have a job lined up first because it might take a little time to find a decent one here. It's a pretty small town so there isn't a big selection to choose from. Other than that, the city does have some things to keep you entertained.
The best area in Burlington is probably along the coast of the Mississippi River. There are also a bunch of public parks throughout the city you can check out. The summer can be pretty fun. It doesn't get too hot and there are usually some parades and festivals you can see.