Just stayed with my wife and 2 kids. Lots of room for all of us. Location is walking distance to the main train station and some other local stations. The just down street right beside is full of shops. There is a nice cafe beside that we had pastries and cappuccino for breakfast. Was interesting to stay in a proper Napolese apartment. The elevator is tiny, but it got us to the apartment just fine.
We walked with big luggage from the train station. Not too much fun. Do yourself a favour and splurge on a cab. Suitcases do not roll nicely on the uneven Naples streets.
2 things you need so do while you visit.
Go to A' Lucianella for dinner. The sign says the specialize in seafood, but the homemade gnocchi was some of the nicest I have had on our trip.
Also, go on the La Neapolis Sotterrata tour. It's 10 euro for adults, but a fun couple hours exploring underground Aqua ducts and WW2 bomb shelters.
Both are just (west?) down via dei Tribunali along with many shops.