During our Africa vacation in April we spent 2 nights on Pride of Zambezi houseboat and 2 nights at Elephant Valley Lodge. The houseboat was great-you board near Kasane. Viewing the animals from the water is great-they all come to the river to drink. There are 3 small houseboats and you can book them for as many nights as you want, even 1. I much preferred the water game drives to the land ones in the park.

http://www.prideofzambezi.com/

If you want to stay on land you can stay in a hotel in Kasane and get a guide to go into Chobe NP each day. The problem with EVL was it took 30 minutes each way to and from the lodge and park. With 2 game drives a day this was a lot of bouncing around in the truck.