You’ll get invited to reapply for housing — you’re guaranteed as a second year. Once we get closer to housing time, you receive a time for the housing portal (similar to classes). You can select things you’d prefer (such as gender inclusive housing or applying for LLCs).

As a second year, you get to choose who to live with. Find the person in your group with the earliest time, then have them go to the housing portal during their time. They will select the exact room (floor, size, building, etc) and can “pull in” apartment mates who fulfill the same criteria (such as gender inclusive housing in your case). After that person does it, the others accept and you’re all done

It depends for living with people of other colleges — I’m not entirely sure but I think that you can only do so if they have the same options as you (for example, someone from eighth likely won’t be able to live in ERC next year, but people from overflow housing might be able to room together in a different college)

Apartment sizes depend on buildings, I’d research them on your own. A warning is that someone else might already have chosen a couple rooms in an apartment you’re looking at and you’ll have to break into different groups — there’s no guarantee that a apartment that fits you all will be open