I'd look at 2 options here.
1.  Definately look at giving renters option of no furniture.  Most people have their own and this could be a stumbling block.  Giving renters an option will widen your "market".

2.  Take a look at improving something easily.  I did it with a very 60's kitchen of yukky-looking (but perfectly clean & usable) wood grain laminex.  Couldn't rent the place (Everton Park, Brisbane) for weeks at $220 and thought I'd have to lower the rent!  So grabbed a can of paint, and I painted over that stuff (soooooo easy).  Even brought the kids along and they occupied themselves by tearing thru an empty house etc.  Rented within days at $240.  I do put it down to the kitchen looking bright and white.  If you can do something easy that you can do cheaply and it brightens the place up, give it a try.

Good luck.