That should be a good salary outside of Pittsburgh since your housing is covered! I would be sure to ask them about how the taxes on the relocation costs and accommodations will work. Technically you will be taxed on these costs since they are compensation.

In my experience with engineering internships they have “taxed up”. Essentially they report higher gross pay on those compensations so that they withhold the taxes for you and you don’t end up paying out of pocket. But this is not guaranteed so be sure to ask so you save appropriately!