Nice atmosfere, cool staff, opened from the first time in the morning til late night... Iter is a good choice for breakfast with coffee and brioche (the way Italians call the croissant), working days lunch (the have a fixed menu) and also for drinks - the menu changes seasonally and has always interesting options. Thanks to its location in a small street between the naviglio grande and pavese, the tourists somehow don't find it.
I consider e/c natural wine shop a hidden treasure in Milan. Inside a building with an "Emergency" (that is actually an ONG) plaque outside, the first thing one might think is that is a hospital. Once passing the wall, there's a cute internal square, with Basilica di Sant'Eustorgio view. You can sit both inside or outside, which a strongly recommend for spring and summer days. A nice place for just passing by to grab a bottle of wine and drink it at home, having a glass of wine (they have many options) or enjoying a relaxed evening.
Art and design museum in the Parco Sempione. Some permanent and some rotating exhibitions. Definitely visit the Casa Lana installation and the Italian Design permanent exhibit.