I only stayed in Valeria's apartment for one night on my way out of Naples and it is exactly as described. Compact and clean, located in the heart of the lively Quartieri Spagnoli.
I had trouble with checkout, as you need a key to unlock the front door of the apartment building (common in Italy), so I needed to ask a neighbor to unlock it for me. Also, it's not mentioned anywhere on the listing but the unit is a 4th floor walk-up in an old building.
Not an issue for me but might be for others.