Excellent location for us, we were attending an event at the music auditorium which is only 10 min walk. Good Italian coffee and pastries right downstairs, also not too far from the metro, piazza del popolo and other touristic landmarks. There are good restaurants and bars (in particular Vintage and Tree bars) right next door if you want enjoy a delightful aperol spritz on the footpath, just as locals do.
If you like to enjoy of fresh air during the summer nights, be mindnful that the main bedroom gets noisy in the early hours of the morning due to heavy traffic -- if you prefer peace and quiet, the apartment has double-glazed windows and put the air-con.
Last but not least, Marcella was a very helpful and accommodating host.