Me and my friend booked the Da Vinci loft for 6 nights in August. After a film crew decided they needed to use our windows, we agreed to transfer to Federico's other apartment on the same floor for 2 nights.
The Da Vinci loft is pretty much as promised and therefore really nice. The location is perfect. It's a calm area but close to night life as well, if needed. All of Rome's main historical attractions are within walking distance.
The AC works well, the WiFi is decent, the bed is comfy enough and the apartment is very clean with clean sheets and towels.
In Federico's other loft in the same floor the AC doesn't quite cover the whole apartment and the upstairs sleeping area is a bit warm. The bed is not quite as comfy, it's a bit squeaky and lopsided. After my friend sleeping two nights on the couch we were happy to transfer back after the film crew was done :)
I found the stairs to the apartment a bit steep and scary, but that's Rome's stairs for you. There weren't too many steps though, it's the third floor.
We didn't get to meet Federico himself, but his friend Alex let us in and made sure we got settled in and had everything we needed.
Thank you for a wonderful stay. I'd warmly recommend the loft :)