I'd throw out the new hotel based on location.
When I choose hotels I use Trip Advisor + I compare reviews with the ones on :
www.venere.com This is a European booking site that has reviews from people AFTER they stay in the hotel which make them very reliable.
I read the ones on both of your original choices and I still think I'd go with the Mariano Cubi location.
It is difficult when you only have so few choices!!
Good luck!
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