I've never gotten a manicure in Pittsburgh, but Miss T looked promising so I decided to give it a shot. And I'm glad I did! Everything about Miss T is so cute and cozy and to top it all off, their service is great! My friend and I got our nails done by Pink and Tu and they were extremely friendly and conversational throughout our time there.
In terms of color variety, they don't have a huge selection of colors but they have the basics so I still managed to find a color that I liked. I really liked how Tu did my nails, and as of today (Day 5) everything still looks perfect! For $20, you can get a decent manicure and nice experience -- I'd strongly recommend Miss T if you're planning on getting a manicure soon!
PS: they do make you complete the payment as your nails are drying, and volunteer to grab your wallet from your bag for you.. A little invasive but oh well.