There seems to be a little confusion about the August holidays in Italy. Agostini is closed from Saturday the 7th at mid day till Monday 23rd. Rentals are possible but only for the full holiday period.
Moto Guzzi and the museum will be closed from 6th to 29th.
Also if you see a sign "zimmer frei" you are probably in Switzerland or Austria so turn around and come back unless you like saurkraut. You are very unlikely to see a sign like that on this side of Lago di Como.
You can follow links from Guzzi Rent at Agostini to find accomodation.
Regards
Peter