Also, if the guests complain about little things, like the temperature of the hot tub, (I didn't realize you could change it, so the guests had "tepid" water for a night. One of them complained.) it's worth changing. I did that and had no complaints about anything the next time I read reviews.
And, the smallest towers can apparently hold a lot of sims. I have about 7 of them so far, and my resort can handle 50+ sims. I was under the impression that they were only for a few people at a time. Guess I was wrong, but I am making more money than I'm spending on upkeep, so that's ok with me.