Apartment is in a location that cannot be beat - took us less than 5 minutes to walk to the Spanish Steps and the Trevi Fountain. The apartment itself is well-appointed, although the kitchen is teeny weeny (fridge is a bar fridge). Beds and pillows are comfortable and the sheets are very soft, the air conditioning was amazing (it was 40+ degrees in Rome when we were there). It was also 5 minutes to the subway. The washing machine was super handy to have since we had to change our clothes twice a day due to the heat. Lots of towels on hand as well, and there was a hair dryer and lots of soap and shampoo on hand. The apartment was also very clean.
The apartment is located in a posh shopping district, but it wasn't all unaffordable - we did some quality shopping without breaking the bank.
There are a few grocery stores very close by - stick with the Coop if you want reasonable prices. We also found out the hard way that you have to weigh your produce yourself and print a ticket for the cashier, otherwise you hold up the line in the grocery store!
There are lots of lovely restaurants in the neighbourhood and the owner left a binder with recommendations.
The owner left us two keys and one of them didn't really work - that is probably my only negative comment. That and the overpowering gigantic room perfume bottle on the dining table which we had to put outside as soon as we came in as it was too much.
The area outside the apartment is very loud - please note. There seemed to be garbage pick up every morning on the street at 7 am! Lots of smashing of glass bottles, etc. Having said that, when I put in my earplugs, I couldn't hear a thing. I slept very well in the nice cool apartment.
I would recommend this apartment to anyone travelling to Rome, with no hesitation. And I would stay here again for sure.