One concern: without a separate exit, I'm not sure if code will allow sleep space in a basement.
If they do, I would not recommend wood floors if there is not a gravity drain, non-sump pump method of drainage.
We have a finished basement, with an in-law apartment, and are moving to this:
http://www.increte.com/
In our case, the shower and toilet required a separate sump pump system below the slab to tie into the sewer drain. Not really an issue.
Concerning the kitchenette, check with the fire code folks and your insurance company about specific appliances they will allow.