I’ll just say this...I’ve probably been in forty-odd Starbucks over the past decade (counting airports in the mix), and there were two or three in particular (in NYC) that were fairly ratty/rundown. I suspect if you graded conditions at all of them....ten-percent would be places that ought to be shutdown or renovated.
I’d also suggest that in Europe...most coffee shops offer superior coffee at a lesser price...so Starbucks is at a disadvantage with a lot of people.
Starbucks isn’t even in the running for good coffee.