Best time to visit Naples, Italy
Naples can be a very great city to visit. But this is really dependent upon the time of the year you want to visit. Not all times of the year are good times to spend in Naples. This is because many of the hotels do not have air conditioning and those that do have it have a poor installation to say the least.
The worst times of the year to visit Naples is around July and August. This is when the evening temperatures do not cool down at night. If you absolutely must stay in Naples during this time of the year then I highly recommend you rent a house or apartment where you can get some air to flow from room to room. This will make the stay much more enjoyable then in a sweltering hotel room.
Ideally if you can visit Naples during the months of April to June and September to October then you will find the evening temperatures to be tolerable to stay in hotel. I know how absolutely horrible it is to stay in someplace where the evening temperature is too high to catch some sleep. You do not want to do this on your vacation or otherwise.
So please avoid the months listed or if you can rent a home or apartment then you should be just fine.