The location of this flat is perfect - the Spanish Steps are, well, steps away! There is so much to see and do in the area, and Giacomo's place makes a great base of ops if you want to ramble around this historic and staggeringly lovely part of Rome. The flat itself is small, so I'd mostly recommend it to couples or 3 friends who don't need privacy. But it's a lovely little place. Some surprisingly good art on the walls; books with helpful information for travellers; clean sheets and comfortable beds. A good shower/bath combo and nice fluffy clean towels. There is a little private balcony/terrace - it's very small but two people can sit and have coffee and hang out quite comfortably. It IS an old building, so you should listen to Giacomo when he tells you how to flip the circuit breaker back on if/when the electricity goes - but if you don't mind the small size and a few quirks due to the age of the building, this place is very nice. It's got a sort of artsy/funky/creative feel to it - not in the kitschy, hipster way, but more like it could be the flat of an artist or a writer.
There are several good restaurants right down the Via Sistina, and also a ciggie shop and a Cash & Carry which has milk, bottled water, crisps, etc. Just a 5-minute walk away is the Museum & Crypt of the Capuchin Friars, which has amazing rooms with decorations and tableaux made of human bones. The Fountain of Trevi is also within easy walking distance. Also, don't skip walking just a block away and seeing the Palazzo Zuccari - or Monster House - built in 1590 by the Baroque artist Federico Zuccari, its front door and windows are decorated with amazing huge monster-faces, with the door and windows set into the mouths! Very cool. Basically, there's so much to see and do within easy walk of Giacomo's place that I wish we'd booked more than 4 nights.