The Argantonio is a small 2 star hotel in a traditional style building, not luxurious, but with considerable charm. I stayed there with a friend mid-November and our room on the third floor was simply decorated, clean and comfortable with a good sized bathroom that had a walk-in shower. Tip: ask for a room with a balcony on the (very quiet) street as these get better light than the interior rooms. Also, the rooms with two beds are considerably larger than those with a double bed. There was also a pleasant little terrace on the roof with a couple of comfy chairs for relaxing with a drink and a book, though the day I was there it was a bit too cold to take advantage of it.
Breakfast was included in the price (79 euros, double occupancy), with fresh hot coffee made to order from the bar, juice and toast, charcuterie, pastries and some hot dishes of eggs and sausages. Another plus was that the staff were friendly and helpful. We came back around midnight from our evening tapeo and a couple was being served a nightcap at the bar in front of the reception area, which I thought was a nice touch. And very important: there's free WiFi with good reception throughout the hotel.
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The location was excellent, on the edge of the old town and not far from the train station, giving easy access to both. Overall I thought it was good value for money. My only tiny "complaints": the lack of a detachable shower head, and that the safe in the closet wasn't bolted down, rendering it pretty much useless. But I would definitely stay here again.