We found the Sheraton to be rather dirty in January 2004. (They did send a maid to re-clean the bathroom.) We were not in the tower, but in one of the outlying buildings. I thought it was spooky around there at night. Coronado Springs was a welcome sight after my husband's convention was over!
there is a Renaissance next door to SW on one side - across the street is a HGVC - Hilton Grand Vacation Club - both are within walking distance to SW.
Hilton Grand Vacation Club is supposed to be really nice, they also have suites. Decent prices too. Had reservations there, but changed to be on disney property.