I wish I could help more. . . but I have only been to Podhalanka. When I go to my studio, I get off the bus at that intersection and walk down Milwaukee. I stop now and again to get lunch to take to the studio (even when I already have food at the studio that I should be eating).
I love the food and I love the interior. The interior is not precisely dingy, rather like a modest Bungalow home. It's small, a little dark, with modest furnishings. Because it's small, it's also had a closed, cluttered feel. My German grandmother and Polish grandmother owned a bar and restaurant when I was a child. I think this place reminds me of that.
When I go, I often sit at what used to be a bar (I am guessing the entire space was once a bar) and wait for my food. This is also where solitary diners often choose to eat much as one would eat at a counter in a diner. I've had some nice chats as I've waited; in my experience, those eating there are often Polish and they always extol the virtues of the menu when I am undecided.
It's a modest place with modest (but delicious and authentic) food. If your relatives would appreciate that, then it's worthy of going to. If they appreciate ambiance more, then I would think there were better choices.