Masha's apartment is clean, quiet, private and in one of the best neighborhoods in Chicago. Rogers Park is the most diverse neighborhood in the city and is known for its restaurants and bars. But it's primarily a residential neighborhood. It's very possible to find quiet time there, if that's what you want. It's a "real" Chicago neighborhood, not at all overrun with tourists but offering plenty to do for anyone who is visiting.
The Metra train stop is very close, the red line CTA a bit less close, but even the walk to the CTA takes you through the heart of Rogers Park. It's a few stops north of Wrigley Field while only being one stop and a quick transfer from Evanston.
You'll also be blown away by Masha's generosity. She treats you like an old friend coming in for a visit. That sort of hospitality can't help but make you feel grounded and taken care of, and waking up in such a warm, and clearly warmly lived in, space only supports those feelings.