Travelling as a couple, we booked two nights on hotels.com for €123, in late August. Driving into Vinaròs we were a bit perturbed, it is not the nicest looking of towns. Free parking on the street very close to the hotel.
Booking in, we realised this is a very family orientated hotel i.e. lots of screaming kids. Ideal if you have children, not so much if you don't. The room was nice and clean, but I wouldn't say 4*. We admired the giant chimney just outside the balcony, then went for a walk to the beach. There's an ok stretch of beach a short walking distance, plenty of eating places, but it's all a bit ragged. Nice breakfast.
Overall, I wouldn't recommend staying here. For the amount we paid, I would have expected either a nice four star hotel or nice location. I didn't particularly feel like we got either.