Stayed at the HIX East. Property is one of the better HIX hotels I've stayed at. It looks quite modern, breakfast is more than your average HIX and staff was really friendly. There are no options for dining around the hotel, but you can order fresh pizza (tasted good!). Downside is the connection to the city center: it takes at least 30 minutes by bus and metro or around the same time by train and metro (transferring at Tiburtina train station).
The HI Aurelia is the only IHG hotel in Rome I haven't stayed at.
If you have any questions, let me know. I'd be happy to help.