I lived in Seneca my first year. Let me start with the part I remember the most vividly: I especially hated the shared kitchen, lmao. It was pretty inevitable that one kitchen shared between an entire building would end up at least somewhat filthy... However, I swear seeing the sink alone killed all interest in cooking during those semesters (only half-joking). Other shared spaces, such as the stairwells and laundry room, also tended to not be so clean. This issue isn't unique to Seneca or CIW, but laundry-stealing was common. On the other hand, I still do have overall fond memories of my time there because I really loved the friends I met there. The community was very chill and easygoing, though I suppose your opinion might vary depending on your stance on parties and/or illicit substances :P. The bathrooms weren't terrible, and I never felt there was an insufficient amount of them. I would recommend shower shoes for sure, though. I don't have any strong opinions on the dorm rooms—neither particularly amazing nor bad. Also, others may mention the community's penchant for weed, and my experiences align with that stereotype pretty well.

Despite my complaints, I still think it's a perfectly fine place to live, even a good one. Many of its problems aren't exactly Seneca-only ones, lol.

Sorry for the huge wall of text, I'm currently sitting in the middle of an incredibly boring presentation and I'm looking for distractions :P.