Time Out says
Bottega Berta is an insiders' tip among locals. There are up to eight different seasonal pasta dishes. It's a tiny restaurant so booking is recommended.
They promise the best pasta in Zurich, and they won't let you down - up to eight different seasonal pasta dishes will make it hard for you to decide and you might end up passing plates around the table so that everyone gets a taste. This tiny establishment with only a handful of tables is an insiders' tip amongst locals and during the winter season a reservation is strongly recommended. The outside area offers more space in summer, but don't worry when you find all the tables occupied - just ask for the next free table and have a beer at a bar on nearby Idaplatz while you wait.