Hi Cazillu29
Thank you for your interest.
Yes, your Interrail pass is enough to use the luggage service.
I would suggest that you consider for yourself whether to send hotel to hotel or station to station by comparing the terms of the two options on this page: https://www.sbb.ch/en/tickets-offers/reservation-luggage/luggage-registration.html?tracking-marketingurl=baggage
As for the safety of sending a laptop in the bag, it is generally safe to do so. However, it is always recommended to take precautions to ensure the safety of your belongings. This includes using a sturdy and secure bag for your laptop, ensuring it is properly packed and protected. In any case, the luggage service includes insurance coverage in case of damage or loss.
On the page listed above you will find all the information about the service.
Wishing you a nice journey in Switzerland
Kind Regards
ElenaG