Other than check in limitations between 3-10pm other facilities was good!
the vaporetto line to get to the hostel is actually kind of expensive (7 euros each trip if you don't get a few days pass) & so it can add up, as well as waiting for the water bus to come and to get back to the island takes some time too. The shared dorms are clean and very modern, however the space can get a little cramped.
the buses from la spezia take a while and don't come often and you need to remember to buy tickets from the tobacchi store first
AC didn't work
The AC machine leaked onto a bed and made it very wet
Around 15 min walk from the metro, not too hard to find. Beds are clean but sharing bunks can really depend on roomies if they move a lot etc. booking ahead may be cheaper!