Mario’s apartment is located in one of Naples’ most fascinating areas and Marco is a nice guy who responds to potential questions very fast. If you come to Naples in Summer the apartment is a good choice for a fair price. I was there in December and since there is no heating it’s not optimal. There are air conditioners which work, but they don’t really replace a normal radiator. I had to stay in quarantine for a week and I came during winter which are both things that may not apply to your planned visit but because of the heating-problems and some shortcomings in terms of cleanliness, I can only give 3 stars, it might be 4 for a visit in summer tho. Have fun in Naples!