B&B Blue Crystal is an incredible value. Most central possible, 100m from Central Station. However, they don’t speak a word of English which makes it a bit difficult to find (due to that the Airbnb app don’t translate that bit and it’s written in Italian.
Find Burger King at the Central Station. Cross the street. Pass the bakery/Coffee Bar. Turn right. In the corner there’s a green door. The B&B is on the 7th floor. There’s an elevator for the not-so-faint-hearted.
There’s what in the US would be called a “complementary continental breakfast” - make your own coffee or tea, and get a plastic-wrapped cookie or biscuit.