@Cal C.
That's it man. That's the key, that's the million dollar question down here that some ask and some don't.
The one's that are doing well do a lot of "little things" but, in my mind, here are the biggest "little" things you can do:
1. refurbish with modern furniture. Successful units have either interior decorators, or the owners are savvy with decor so that it looks NICE in photos.
2. That's the next point: photos. Hire a professional photographer for $200-300 to take amazing photos of your property. It makes all the difference when people are browsing 100 properties on Homeaway.com
3. TV's. Have a flatscreen in every bedroom, cleanly mounted without tacky wires. They don't have to be big in the bedrooms, just have them in there. Have a really big one (modern) in the main room. People eat that up. Flatscreens are cheap nowadays compared to when most of these homes were originally purchased.. in my mind, this should be a given.
There are other factors like management, location, amenities, but.. it usually boils down to what people see on the internet, the better you can make it look there, vacationers don't care about the other stuff as long as it's up to standard with other communities.