My boyfriend and I spent 4 nights here in mid April and it was simply wonderful.
Ariele and his brother Lorenzo were really kind hosts who took extra care to help us with our journey such as offering their own driver to get to the place (which I preferred to a normal taxi since it meant there was no confusions with the address as he knew exactly where we were staying) and even letting us leave our bags after check out since our flights were so late and we were worried about carrying them around with us all day.
The apartment itself was impeccably clean and tidy. We loved the platform that the bed was on (although a warning to the clumsy among you- it is very easy to hit your head on the ceiling if you're not careful/slightly drunk) and the appliances were great and provided everything we needed for our stay (we were especially grateful for the substantial amount of cooking and eating utensils and the aircon). We also adored the window doors and we liked to open them up when it was sunny and move the chairs next to it so we could drink some wine in the sunshine and enjoy a refreshing breeze. A slight warning about the bathroom window though- there are no blinds/curtains so you are a little exposed but it's such a calm and secluded area that there's rarely an occasion that anyone might see you, and they only would at certain angles which can be avoided.
Another thing to mention is that I didn't expect it to be so easy to get into the centre of Rome from the apartment but we found it really was. There is a bus stop only about 30 seconds walk away once you get down the stairs (which by the way were tiring but also beautiful and there is a lovely family of cats living near the top) and we found the 916 bus was really helpful to get into town (we mostly used it to get to Piazza Navona and then walked to other places from there) although it is also very easy to get there by walking and if you do there's a really good but nicely affordable ice cream place on the way before you get to the tunnel- I recommend the Oreo flavour.
The Vatican itself is only a few minutes walk away which was really great as well.
Overall it was a lovely stay and I couldn't have asked for a better place to be in for our trip, I even find myself missing it now that we are back. I recommend it highly to anyone wanting to spend some time in Rome.