The apartment is exactly as described, it's in a very convenient location (only about a five minute walk from the metro station). If you're looking to sight see you'll be able to take the metro to the Napoli Garibaldi station and from there you'll have trains to all main sightseeing activities (from Pompeii to Sorrento etc).
As far as the finer details within the apartment, you have all the expected amenities including a very nice coffee machine. Furthermore, if you have any questions the host is very attentive and is very close by so will be able to help in any situation. The area was incredibly clean, with more than enough space for the two of us. The host also gave us a comprehensive list of places/eateries to visit from cheap to more expensive and everything in-between.
Overall, we are very happy with our experience here, a very easy place to recommend to anyone wanting to visit Naples.