We were wandering around the fancy shopping area to the west of Piazza di Spagna and noticed a lovely dining area in an interior courtyard off Via della Croce. Figured out that it was Otello alla Concordia, which has its main entrance and sign around the corner on Via Mario De Fiori. The daily specials included pajata, coratella, and puntarelle, and there was no obvious pandering to tourists beyond an English menu, so we gave it a shot.
Fiori di zucca (€6) were the most anchovy-dominated version of the trip to date, very nice with the house white Frascati (€12 / 750). Antipasto Otello (€12) included some of the best prosciutto we've had on the trip plus some pecorino, olives, sun-dried tomatoes, fried zucchini, etc.
Tortiglioni all'amatriciana (€11) were very good but I feel like I could make that at home so why don't I learn and just order alla carbonara every time? My dining companion had tonarelli cacio e pepe (€10), which to me is like "spaghetti with bacon and eggs" minus the bacon and eggs. Never again.
Unfortunately did not have appetite left for any of the very appealing secondi.
With another bottle of house red Chianti, a liter of gassoza, one sgroppino, some kind of custard dessert, a couple of coffees, and coperto, total was €82, very reasonable. Another excellent choice if you're looking for an oasis in the middle of tourist chaos.