Elisabetta's apartment is in a great location. It's a buzzing [but not noisy] area within 5-10 minutes of two metro stations. There's a wine shop/bar just below, with a pizza cafe, bakery, pharmacy on the same street, and a small supermarket just round the corner. We felt very safe staying there.
The apartment is compact, with the bedroom and bathroom on a mezzanine floor above the living area. There's also a small balcony which would be great to use in Summer. There are two internal flights of narrow stone steps up to the flat, but this would not present a problem to most people.
Check in and checkout were no problem - we had an extremely early flight home and Elisabetta arranged a taxi for us at a good rate, so we didn't have to worry about organising this for ourselves.
Finally, we hired Elisabetta as our personal guide for our visit to Pompeii. This was a wonderful experience and enabled us to benefit from Elisabetta's many years' knowledge - thank you Elisabetta for a lovely stay in Napoli!