Chaumont-sur-Loire is home to many highly-rated hotels, one of which is Le Motu Loire, which has a current rating of 7.6. For other potential stays, consider La Maison Du Pecheur and Gite de la Ronceraie, which can also be great places to stay in Chaumont-sur-Loire.
A good hotel close to Chateau de Chaumont is Le Motu Loire (rated 7.6/10 from 170 reviews).