We had a nice stay at Dea's. We were welcomed by Dea's dad. He explained us the essential about the flat and Naples in a mix of English, Italian and French to be more understandable.
The flat was nice. But it's a little tricky to find when you don't know the neighbourhood (we recommend looking on a map before arriving and not fully trust the GPS).
The bedding was comfortable. The bathroom and kitchen are small. We are tall people so the shower can be a little narrow.