It mostly depends on how fast you wanna sell it.
It's worth a lot to the right person.
Is it in "showroom" condition or is it simply "restorable"? "Nice" is a subjective term, so I can't say for sure.
Also, whether you sell it "as-is" ($800-1000?) or in running condition ($2000-$2200?) will make a difference too.
If I were you:
I'd take it apart and grease all the bearings in the wheels, swingarm, and steering head.
I'd lube or replace the cables.
Check the brakes.
Check the chain and sprockets.
Get a new air filter.
Put on new tubes and tires.
Clean the carb.
Flush the gas tank.
Install a fuel filter.
Change the oil.
Get a new battery (?).
Replace the points.
Remove the plug(s) and squirt a little oil in the cylinder(s).
Put in new plug(s).
Fire it up and go for a ride. There ain't no reason to sell it.
I guarantee you it's value increases daily.