Firstly let me convey the positives:
The host was very nice and extremely helpful and responsive.
Bedrooms and living areas were spacious and clean and the beds extremely comfortable. The shower is of a good size and always nice hot water. Air conditioners worked well.
However, when we arrived at the place I almost immediately wanted to look for a hotel. This apartment is down a narrow dirty alleyway. The building is run down with plaster falling off the walls. The flat itself is not too bad but we are just used to much higher standards for the price. There were many broken floor tiles and mould was growing in the bathroom tiles and the showerhead could have used descaling. The power kept tripping if you tried to use more than one plate on the stove. The oven was absolutely filthy and looked like it had not been cleaned after the last visitors. There is no lift in the building and the apartment is on the second floor so a bit of a problem for heavy luggage.
The surrounding area is always dirty and the noise late into the night is a problem. Some people may enjoy the experience of being right in the heart of Naples but we certainly did not.