The first time I took Amtrak, we signed up for a roomette on a Superliner (SWC), but for some reason, about 2 weeks prior to the trip, we got an email from Amtrak indicating that they were moving us to the H room (no extra cost to us). I enjoyed the roominess and the degree of isolation that allowed me to practice my flute without bothering anyone (at least no one complained to me), but the unenclosed toilet and being next to the groups of public toilets did lend an "air" of unpleasantness that never dissipated. It wasn't terrible, but I do remember it with disfavor. Something to consider depending on your ability to handle bad odors. My ability is very low.