The apartment is located a stone's throw from the Pantheon, so you really can't beat it on location, as you'll be within walking distance (30 minutes) of all the major sights and monuments of Rome.
It's the second floor of an old building, above an hosteria, but although you do get some street noise, insulation in the windows is quite good, so unless you require absolute silence you will be fine. We did get some neighbour making some noise, but that is down to luck - some days it didn't happen.
The appartment has two rooms, one bigger with a dresser and a closet and a smaller one with only the nightstands, so I would recommend it first for families. It has two bathrooms (with shower) which are on the other side of the appartment next to each other - it's a bit of strange arrangement, but do allow two people to use them simultaneously.
It also has a small fully equipped kitchen, with a small stove, fridge, dishwasher and a washing machine, but we didn't use them, so cannot comment. Both rooms have A/C units.
Beds were really comfortable (on the rather harder than soft side, which is a great change from the usual you plus your spine sink in), so all and all a very pleasant stay. Recommended!