The apartment is very nice, clean, and modern-looking. There's an air conditioner in both the living room and bedroom, which kept it nice and cool despite the summer heat.
The best part of location is that, even though it's not within walking distance of most sites tourists would be interested in, it's just across the street from a subway stop entrance, so it's still pretty easy to get around. It's also about a 15 min walk from the main train station and similar distance from the Colosseum.
The host was quite responsive, though there was a communication issue when we arrived. The person greeting us thought there was an extra person charge, which had not be communicated in advance to me. He called the host and cleared it up. But travelers should also note that there was a city tax of 3.50 euro per person per night, to be paid in cash upfront at check-in. This also wasn't communicated ahead of time, so it was a good thing we had already been in another city in Italy first and had local currency on hand.