We had a lovely stay at Elsa & Karol's apartment. They went the extra-mile for us by storing our luggage before check-in and after check-out as we arrived early in the morning and left late in the evening, which made our stay way more relaxing.
The place was perfectly clean and had everything we needed. There's an AC in both rooms, so you can keep the one in the kitchen-area also running at night if you're sensitive like we are. If you're a light sleeper you might want to bring ear-plugs as you can hear the music from the restaurant downstairs a little bit until they close and the neighbours of the adjacent apartment - but nothing out of the ordinary, we had a good sleep.
The apartment is located in Chinatown, near Cimitero Monumentale and Parco Sempione. The Duomo respectively the city center is roughly a 25min walk, we always try to explore cities by foot and only took the Metro to Navigli and back.
For breakfast we went to Brera but there are also plenty of restaurants in the vicinity.