There are many more options, but here are just a few. Also AirBnB is a great resource here with plenty of fun options (we stayed at the Lemon Moon Cottage and recommend that if available).
Hotel
Fairfield Inn & Suites Sebastopol
1101 Gravenstein Highway South Sebastopol, CA 95472 707-829-6677
Hotel
Hyatt Regency Sonoma Wine Country
170 Railroad Street Santa Rosa, CA 95401 (707) 284-1234
Hotel
DoubleTree by Hilton Hotel Sonoma Wine Country
1 Doubletree Drive Rohnert Park, CA 94928 (707) 584-5466
Hotel
Oxford Suites Sonoma County - Rohnert Park
Rohnert Park, CA 94928 (707) 584-0333
Hotel
Best Western Garden Inn
1500 Santa Rosa Avenue Santa Rosa, CA 95404 (707) 546-4031
Hotel
Hampton Inn & Suites Rohnert Park - Sonoma County
6248 Redwood Drive Rohnert Park, CA 94928 (707) 586-8700
Hotel
The Sandman Hotel
3421 Cleveland Avenue Santa Rosa, CA 95403 (707) 293-2100