The people I work with, the work I was doing itself, and the perks Houlihan provided. When you work a lot of hours in investment banking, it really is the little things that make all the difference.
It wasn't really a huge concern for me, but if I had to pick one thing, it would be the length of the internship. Because of the nature of Houlihan's lines of work (e.g. Financial Advisory Services works on a lot of deals that happen over a short period of time; Financial Restructuring Group works on fewer deals that happen over a longer amount of time), not everyone is able to see all aspects of a deal during their summer internship.
Advice to Potential Interns
Houlihan is the kind of firm that likes to recruit people who "take the bull by the horns" and are "out-of-the-box thinkers." Strong technical skills and a willingness to learn are important.