We stayed at Giovi's for four nights in the height of summer and it was lovely. The four of us arrived and tossed a coin to decide who got the room with aircon inside and who got the ensuite. Both were lovely and everyone was satisfied with their rooms.
The location is perfect, very close to many lovely restaurants and also close to many of the major attractions in Rome. Despite its prime location it was also delightfully quiet, a nice sanctuary from the busy streets and stalls in the middle of the hot days (also the aircon was a life saver).
Allan (Giovi's housekeeper) met the other couple on their arrival and explained what needed explaining and all four of us had a lovely time.
Giovi was also very accommodating with check out times, we had booked late flights but he said that as there was no immediate booking after us we could leave later in the day without causing any difficulties rather than spending a half day in the Rome airport!
Overall it was a lovely stay, great apartment and a fantastic location, couldn't be happier!