Congratulations!
My daughter, a freshman at UCh, was also accepted in EA and waited for RD results (accepted in 7) even though UChicago was her first choice. Once she visited the first time, she could not imagine being in any other place. She loved the university but also wanted to be near a big city. Chicago offers everything that she likes to do on her (rare) spare time (especially museums and nice restaurants).
She is in South (Grossman-Granville) and made her dorm request in April. She got her first choice and a single. She loves her house and its traditions. Dorms and bathrooms are perfectly well maintained, and the dining hall is only a few steps from her building entrance. The housing system is just amazing, and new students feel at home from day one (at least her group).
Academically, the first weeks of classes were a bit stressful. She was coming from being a top (2%) student in an extremely competitive private prep school (she did 15 AP classes all with 5’s and A’s), and she did not expect the classes to be so hard and demanding, especially math (she is doing 16000, one of the hardest math sequences). Her teacher has a Ph.D. in math from MIT (she has the same teacher for 16200).
At the end, she got straight A’s in her first quarter by studying more than ever.
She and her group of friends usually go to the city on Saturdays for dinner, but leave around 5:30, and by 9 they are back. A few Sundays, they go for brunch and the Art Institute.They take the CTA.
Campus safety is very efficient and present in every corner, but students need to be careful anyway.
On Fridays, they stay in the lounge (she is not into parties), watching movies or playing Nintendo, and very often, studying as well. As @NorthLeftCoast said, it is not a cut-throat environment. Kids are extremely smart but nice, supportive and down to earth.
My daughter says that she cannot imagine being happier in any other place.