This was my first time in Rome and I couldn't have asked for a better location. The walk to the Colosseum is a bit long, but helps to work off the Gelato :-) . Everything else is very close and the neighborhood is friendly and safe with many options for restaurants as well as a grocery store and pharmacy on the same block. Almost forgot that there is also a Taxi stand at the beginning of the street! Didn't realize how amazing this was until the few times we used it (to the airport, to the Borghese...). If there was a 6th star for location, this is the place that would win it.
In addition, the balcony is simply amazing. We spent many evenings up top watching the moon rise and enjoying a bottle of wine.
All of the bedrooms were very functional and practical (we have two boys, one claimed the loft and loved it!) . There was a TV, but we never turned it on (too much to enjoy outside). WiFi worked well and we really enjoyed the Nespresso machine (we have one at home and were happy to have this as an amenity!)
The two bathrooms were great to have. There is a tub (we didn't use) and a very nice shower.
The steps up to the apartment were manageable and there is an elevator so you don't need to carry heavy things up the steps.
Dishwasher and clothes washer/dryer were nice to have as well (tho the Washer/Dryer was a bit tough to figure out how to use (looked online for the user manual and all was well)
One thing we didn't notice until the end of the trip was "what to do with the trash" (we filled the recycling the last day so didn't notice until then). I would ask the host about what to do if you plan on staying more than one week.
Overall, I can't recommend the apartment enough. It was a great home base as we walked around Rome and toured the Vatican.