A Roma apartment was absolutely perfect for our stay!!! The place is 100% cute, clean, and comfortable, and is just like the pictures!
Most importantly, it is in such a perfect location, central to everything! I scoured Airbnb looking for a central location in Rome that was QUIET without street noise or noise from partying at bars, and this was the main selling factor in this place, and I was not disappointed. It is on a very quiet street (only pedestrians and taxis are allowed on the street). When you are walking down the street, you feel you have stepped back centuries, walking down the cobblestones in a narrow tiny street built for people and horses, not cars! The living room windows face the street, and there was never any street noise! The bedroom windows face an internal courtyard. The apartment is (from an American point of view) on the second story of the building, and, so it's more private than street level, but not too many stairs, so this was an ideal situation to me.
For me, this was the best of both worlds: you have the wonderful central location that is perfect for walking and seeing everything, but it is quiet and possible to sleep without earplugs. Perfect!
A/C works GREAT - there are 2 units (living room, bedroom). They are the fancy new "mini-split" kind that is very common in Europe, and some larger cities up north where there is older architecture (difficult to add duct work). These are not like the cheaper window units at home - they are very new and powerful and high efficiency. It was HOT when we were in Rome - 90 every day - and it was very comfortable in the apartment. The mini-split AC is a very nice solution for having powerful AC but not destroying the beautiful wooden beam ceiling. Which is BELLISSIMA by the way!! Photos do not do it justice!
Everything was furnished and designed tastefully and practically. I love the turquoise, I love the tile, I love all the IKEA stuff in the kitchen, and the mattress was super comfortable. The most comfortable mattress for our whole trip, even better than nice hotels. The washer works great - but it does take longer than an American one so plan accordingly. There is a big drying rack in the closet that folds out plenty big, so don't worry about not having a dryer.
Check in was great. They greet you in person to give you the keys and show you the place. Location was fantastic. Despite being exhausted from a long travel day, we very easily walked to the Pantheon and Trevi Fountain and got dinner and gelato. The next day, we rented "Bird bikes" and rode bikes across the Tiber to the Vatican and got there very easily (rental app on your iphone- highly recommend the on-demand scooter and bike apps - there are many - Bird, Lime, etc, download them all, so you can find whatever is closest to you).
Walk down, about 4 doors down is a wonderful restaurant, Osteria dei Cappellari - they have very good gnocchi with oxtail ragu sauce. This was my best meal in Rome. Also they have the best tiramisu.
If you need to store your bags somewhere before or after check-in, check-out, we used Deposito Bagagli on Via della Chiesa Nuova 17, and I would recommend them. The bags get stored in a back room, and no one but staff is allowed back there, it was safe and secure, so we could keep exploring Rome bag-free until it was time to catch our late flight. (There are places like this all over Europe - turns out - FYI for Americans. If you're backpacking in Europe like us it's a good solution for dropping your backpack somewhere and exploring without 35 pounds on your back.)

Not only is the apartment perfect, the hosts are incredibly helpful and hospitable. Fabiola and Marco went above and beyond!! Communication was perfect and timely. They were very helpful and approachable, giving us advice for transportation and restaurants, and even ordered us a taxi when we needed it! I accidentally locked myself out and they were super helpful and understanding about getting us back into the unit in the most convenient way possible. They were very helpful and gracious hosts. (Note: Be careful with the door, it is not like an American door - the skeleton key *IS* the "doorknob" - you cannot turn the latch without the key! So DO NOT step out the door without it - not even to get a cappuchino. Keep it in your pocket at all times. But that being said - the positive side is - the door and lock mechanism are built like Fort Knox!! There is NO WAY anyone could break into this door, so you and your passports, are SUPER SAFE in downtown Rome.)