You should call with requests. There is still some question with new systems whether the requests are being transferred to the room assignments, but the general advice I've seen is still to call with requests. I called last week with requests and the CM took them...doesn't mean they will get honored, but she didn't say no.
Online check-in does not have a free-form spot for requests anyway; you can only choose from ground floor, near transportation, fridge, or pack-n-play.
Ok, thanks!
One more question (sorry!!)....when should I call? Does it matter? I am arriving 5/8!