Firstly, the property is absolutely spectacular. Ercolano is quite scary, the city seems to be really corrupt, impoverished and not safe, but the premises of Hotel Villa Signorini seem to be secure.
The staff are lovely, we were upgraded to the 18th century villa for our honeymoon for no additional charge.
The room was absolutely incredible and brimming with history. I do understand that with character comes some degradation, but I do think this hotel is overdue for some repairs. The communal spaces are well kept, but the plaster and paint on our ceiling was flaking off and the marble in the bathroom looked as though it had been stained with blood some years ago.
I would recommend staying in the villa itself, the rooms outside it are what you would find at a roadside motel in the states.
We ate at the hotel three times, the food was surprisingly good and all meals were very enjoyable. It was a little overpriced for what it was, but we paid for the convenience.
If you want to stay near Pompeii or the ruins of the Herculaneum, I would recommend it. But, there is not much to see or do in Ercolano, and going out after dark is at your own discretion.