Miscellaneous: Although things tend to cool off at night, if you're an American and used to air conditioning, you may find that it is well worth your while to bring a small battery-powered fan with you, or to purchase a slightly larger fan which has the appropriate plug for Italian current. I brought two of the former and we never did get around to buying the latter -- but we certainly would have been much more comfortable had we done so, and at minimal cost.
Toiletries and Medical Supplies:
The hotel provides a lovely set of toiletries, shower cap, bath gel, shampoo, conditioner, shoeshine (we are in Italy after all) sponge, and moisturizer in travel sizes.
Miscellaneous: Some parts of Perugia can be very noisy. Our hotel room window opened out over the street and a restaurant so without earplugs it would have been very difficult to get a decent night's sleep.