I'm not a travel agent, but GR seems to be very compartmentalized. That is, there are many swanky downtown hotels that won't be cheap, and then there are many chains (from cheap to swanky) on 28th Street, which is a good 15-20 minute drive from Secchia. You can assume no traffic in the mornings that would make a Google Maps trip faster than it says. 28th Street is where all the big box stores are concentrated in GR, so a very boring place to actually stay.
I would STRONGLY advise against relying on a taxi. Taxis in GR tend to not show up on time, even when you schedule and tip the guy heavily when he maybe picked you up from the train station. You don't want to have to worry about being late because of a taxi before interviewing...
Almost anywhere in downtown is within walking distance of Secchia. I don't know when you're interviewing (i.e. if it's within a week or so, idk when the next GR interview is), but as of yet, snow has not even been a thought to GR. So I guess look at the different costs and figure out what is more important to you...