If you go to Il Secchio e l'Olivaro at Porto Fluviale, expect a lively, no-frills seafood trattoria known for fresh fish, generous fritto misto and simple pasta with clams or prawns. It fills up at dinner with locals, so book ahead or arrive early; service is efficient and unpretentious. Getting there is easiest by public transport from Ostiense or by taxi, since street parking is limited. Prices are reasonable for the quality, most places take cards but keep some cash just in case, and it is ideal if you want straightforward, well-prepared seafood in a casual setting.