You can find Hotels at Grevena at:

http://www.greekhotels.gr/north_greece_hotels/macedonia_hotels/grevena_hotels/grevena_town_hotels.asp?id=272

You can also find smaller hotels at near villages:

http://www.greekhotels.gr/north_greece_hotels/macedonia_hotels/grevena_hotels.asp?show=Both

The Villages are 10-30kms away, and about 20' - 45' distance time