As the other reviewers said, Sigrid and her family are very welcoming! She is very motherly and is a fun host. I enjoyed going on trips with her, cooking with her, and exchanging stories. Sigrid's English is also very good, so you will definitely have a good time here.
I stayed here for one month as a visiting student @ ETH, and it is roughly a 15-20 minute walk to the university. The location isn't completely central, you won't walk out to be surrounded by bars and restaurants, but with public transportation it is quite easy to get around. The rooms and apartment are clean and comfortable, and all the facilities are clean. Thanks for your hospitality, Sigrid and Pauli!