The Hilton is located out of the city center so it should a tad cooler there. There is a free shuttle to Piazza Barberini. The location isn't ideal for sightseeing but it is hard to pass up a free room. Be sure to watch out for add-on charges. If breakfast isn't included don't eat at the Hilton. This hotel has a pool but the charges are steep.

Rome will be open and full of tourists in August. Some restaurants will be closed for holidays but there are so many restaurants in Rome that it won't effect your trip.