Just one word: Great!
The appartment is bigger than we see on the photos. It is clean, it has all equipment which is described, all was working fine. The bed was perfect, we slept great. The appartment is near public transportation facilities, which is really interesting.
Marina is a nice host, who pays attention to details like: detergent for the washing machine and the dishwasher, there was even some food for a quick lunch. In the appartment there are maps and folders available about tourist attractions in and around Naples. We will for sure return to Naples in the future and will stay in Marina's appartment again if possible.