I can fully recommend the flat. It is very neat and tidy with stylish interior. The bathroom is modern and the kitchen had everything we needed for our short stay. The extra bed is nicely integrated into the flat. The surrounding area is very lively -- it's a bit loud if you leave the window open, but you won't notice the street noise when the windows are closed. There are a lot of shops and nice restaurants in the area and Silvia gave us nice recommendations. It's also very close to Castel Sant'Angelo and the Vatican.
Silvia and Edoardo have been nice hosts. There was a bit of miscommunication about the check-out times, but this was entirely my fault as I misread one of Silvia's texts. Other than that communication was effortless. As mentioned earlier the tips that Silvia gave were very nice. All in all I can fully recommend staying at Silvia's and Edoardo's place!