Giovanni's place is perfect if you want to live like a local in Rome. We two friends stayed for a week in complete comfort. The bedrooms are roomy and each has its own bathroom. The living room and 4-seat table are great for hanging out. Plenty of coffee, tea, juice, and breakfast foods. There's no stove but electric kettle and coffee machine were fine for us.
The neighborhood has everything: cappuccino & sandwiches downstairs, grocery and farmers' market a few steps away, gelato, pizza. We also ate wonderfully at L'Isola d'Oro and Il Tirso (both Sardinian restaurants). It's easy to take buses, trams and taxis to the major tourist sites but you always come home to peace & quiet. The windows are soundproof! In the summer, though, it might be hot.
At 1pm, check-in is unusually early, which gives you more of the first day to explore. Giovanni greeted us and spent a lot of time explaining everything. He is a wonderful host and we loved living among his carefully curated things (including family photos). Some airbnbs are rather bland but Giovanni's place is full of whimsy and delight.
If you don't mind being a bit farther from Centro and you anticipate spending time at home (not just running around every minute), then it's absolutely a perfect base. Parioli is close to Villa Borghese but we also found other cool places by accident just wandering around. Tons of shops and a superb pasticceria (Danieli) if you walk 15-20 minutes. Highly recommended!