Accept no imitations: Da Francesco is the genuine centro storico pizzeria article. You can try booking but your reservation is all too likely to be forgotten. Get there before 8pm, however, and you can generally walk right on in; if you get there much after, you'll have to join the queue. The reasons for this popularity are very simple: tasty pizzas; a warm, traditional ambience; brisk but friendly service; and a range of competent, classic primi and secondi for those who can't face a doughy disc. You often get the distinct feeling that they are rushing you through to free up the table - but that's the price you pay for such a centro storico bargain.