We stayed here for 3 nights and enjoyed it very much. The place is very clean and just like in the pictures. Everything you need is present.
We explored the city by foot, but you can also easily take the bus or metro to the other parts of the city. The appartement is nearby the station Garibaldi (train, metro and bus).
The neighbourhood is a bit dirty (trash,..) but this is just a characteristic thing in Napoli everywhere.
I would definitly recommend Armando's place :)