My guest and I stayed in Carlo's apartment for just a few days. It was a wonderful stay. It is about a 10-15 minute walk from the train station. There is an elevator that one can easily take to the apartment.
Carlo is very responsive and quick to answer any and all questions that we asked him. He even left out some breakfast foods for us. The apartment has all the amenities we needed and we could have easily made meals for ourselves with all the kitchen supplies. The bathroom is spacious and the room has a view of Mount Vesuvius. I would recommend Carlo's apartment!