We stayed at Ilarias for 6 days to get to know Rome. The pure location of the apartment is perfect for tourism.
The Check-In is manual and in person, but there are lots of Cafes around to bridge the waiting time.
The apartment is rather basic, not luxury. The often described smelling of the plumming I cannot confirm. There are two bathrooms what I considered very practical since we were travailing with three persons. Keep in mind that there is just one proper sleepingroom. The sleeping couch in the living room is not as comfortable.
The Airconditioning was functioning and precious. I was little sad because the kitchen was dirty and equipment for cooking was rather rare. Nevertheless, since there are lots of restaurants in Monti we had outside food which i can highly recommend.