Everything is expensive in New Orleans. And it's also a city that never fully recovered from Katrina. So if you are trying to get something nice, you may be looking to pay anything over 150.
About this place: A little old that gives it that peculiar smell. Don't expect anything fancy. The apartment is connected to the host's kitchen's house with a glass door where they can see you and you can see them. It is clean, but like I said, it's old. We weren't very comfortable though we weren't able to afford anything better.
Make sure you use google maps since iPhone will take you to a different neighborhood that might be really dangerous.
About Jonathan, he is a very nice guy. Polite and very respectful. He will make you feel welcomed.