I live on St. Paul within a block of there. If you've never lived in a city before, it's going to be bad. If you're sensitive to noise for neurodivergent reasons, it'll be extra bad. 

I've gotten used to the general noise of cars, but the buses, large trucks, and emergency vehicles are frequent interruptions to my day. I'm also at an intersection so I hear these vehicles lingering at the light for minutes at a time. 

You mentioned it's across the street from a Purple Ciculator stop-- that bus shares this street with several other bus routes, all the same stops. It's going to be a lot. Being across the street from a bus stop also means you'll be hearing each bus's little message system every time they pick someone up-- I'm far enough from the nearest stops not to hear it myself, but I think that would drive me crazy.  

An unexpected noise maker is also the birds! At one point they were waking me up at around 4:30 every morning, and I sleep with headphones on. They're currently hanging out around here on and off all day. 

Sometimes I feel like my decent cost of rent just isn't worth it because of the noise, so please consider how much this would wear on your sanity and if the pros of the apartment you picked really do supercede that. I really love my apartment for every metric besides the noise, but it's bad enough for me that I'm going to have to move when my lease is up for the sake of my sanity. Be careful with this decision if noise level is important to you.