Our 17B has the gaucho bunk. It also came with the toilet but no shower. I don't think I've missed the shower in that small space nor do I miss the humidity that would be created by a shower in a small trailer. I would miss the toilet especially for those nocturnal visits.
I have mixed feelings about the gaucho bunk.
When I use the trailer by myself, I often leave the rear table set up as an office/computer space (work related) and sleep up front on the small bed. With the gaucho bunk in the down position, it blocks off 4" or so of the width of the bed, When it is up, the width is gained back but trying to crawl into the lower bunk is sort of like trying to crawl into a small cave. Works well for smaller kids but not so well for old dogs. The upper bunk is rated for a maximum of 200 lbs. I don't think I want to test that. I've been considering removing the gaucho bed at least temporarily. When the grand urchins come and join us, they love the gaucho bunk on the top, and the "cave" down below.
When my wife is with me, we leave the rear table down as a bed and use the front table for eating on. Again, with the gaucho bed down, the seating area is a little cramped and the table I suspect is narrowed down to accommodate the space taken by the folded down gaucho bunk.
In small trailers, everything is a compromise when it comes to space.