We had a group of 14 (6 adults and 8 children ages 13 to 6), so we rented all three apartments. They are all beautiful. They're located in a lovely section of the city near the Borghese Gallery and the Spanish Steps and about a 10 minute walk to the Barberini metro station. All of the apartments are on the same floor and there is an elevator to help with luggage, but it was also handy for my dad who has a lung disease, and for the small children who were tired after a long day of walking. The neighborhood felt very safe and the apartments are secure. They are in a locked building and there is a locked outer door once you get on the floor of the apartments. All 3 apartments share a foyer, but each apartment can be individually locked off. When you leave your apartment you take your key out of the wall which will automatically turn off the lights in the apartment. That was very handy. Emilia and Lazio each have 2 bedrooms and 2 baths and a foldout sofa (sleeping 6) and La Corte has 1 bedroom and 2 bathrooms with a foldout sleeping sofa. Lazia also has a balcony. The only thing we disliked about the area is that the restaurants nearby were pricey, but you don't have to walk too far to find affordable eating options, and there is a grocery store a 5 minute walk away.
The apartments are very modern and elegant. The furnishings are great and each apartment has a small kitchen. We could have used a few extra plates and bowls, etc. so we didn't have to run the dishwasher quite so often, but that was a small inconvenience. Yes, there is a dishwasher in each apartment and a washing machine too. There is noise from the street, but nothing excessive, and if you wear earplugs you'll be fine. There were robes, slippers, and small toiletries available if you forgot something from home. Note that the mattresses are very, very firm. I think everyone in our party was okay with this, but if you're not used to a firm mattress it could make for a rough night's sleep. The beds are king size, however, and that was nice. Check-in was easy and Francesca did a great job of arranging everything for us and setting up a seamless transfer to the airport for us.
I would not hesitate to stay here again. Whether you're renting one or two of the apartments or all three, they are a great choice in Rome.