Laugh. I was hoping no one would ask since I don't have a great answer! We used "An introduction to Hilbert space" by Young. It's fine? There's stuff in there like Sturm-Liouville systems that I don't particularly use or care for. I also never use it as a reference.
Here's a hodgepodge of other books related to functional analysis that I like more, but don't directly answer your question. I got a lot of benefit out of "Convex Functional Analysis" by Kurdila and Zabarankin. They sort of have a high level overview of different functional analysis topics, including Hilbert Spaces, but with the ultimate goal of proving what they call the Generalized Weierstrass Theorem. Essentially, when does a function has an inf and when is it attained. Even if you don't care about optimization theory, I very much appreciated their survey of topics to get there.
I occasionally also use "Introductory Functional Analysis with Applications" by Kreyszig as a reference. I think this was the first time I saw cleanly the difference between an adjoint and the Hilbert-adjoint of an operator, which was constantly confusing to me prior to that point.
The last one I like is "Nonlinear Funtional Analysis and its Applications I: Fixed-Point Theorems" by Zeidler. He wrote, I think, five volumes, but this is the only one that I use. Anyway, he presents differentiation, Taylor theorem, and the implicit function theorem very well in function spaces. The first four chapters are great as a reference.
Since I'm listing off obscure books, for integration, I like "A Concise Introduction to the Theory of Integration" by Stroock. I actually don't like his newer book, "Essentials of Integration Theory for Analysis" as much as the older book. Anyway, I find it very dense, but well written. Essentially, I like the first five chapters, which culminates with the divergence theorem, which ultimately gives a precise description of integration by parts in more than one dimension. He also answers precisely the question about the difference between Reimann and Lebesgue integrals.