We had a wonderful time at Roberta's place with our one and a half year old child. The place itself is wonderful, with a lot of space outdoors, and the indoor space has everything you need as a base for travelling around Napoli and the surrounding area. The apartment itself has a wonderfully kitted out kitchen, and the air conditioning is heavenly in the warmer months as an oasis from the midday sun. Roberta and Carlo were extremely welcoming, quickly answered any questions we had, and made sure we had everything we needed for us and our daughter to really enjoy our stay!
The only thing we would add is to make sure you bring a car (Roberta also recommended this), everything you need is within walking distance (two supermarkets, cafes, restaurants, and a wonderful pizzeria at the top of the road) but you need a car to explore what the region really has to offer. The caveat with that is that make sure you don't take a big car - our car rental company kindly 'upgraded' us (apparently this is a common thing) to a car that was difficult to fit through the entrance gates to Roberta's property. We managed, and an experienced driver used to tight spaces might not have the same problem, but for a relaxing trip we'd recommend taking a smaller car - in general it makes driving in Napoli 10x easier!