my guest bathroom

Since I started remodeling my master bathroom, I've been using the guest bathroom. There are a few things my guests should have shared with me in the 3 years I've been here so I could improve their user experience. For one thing, this shower gets really hot really fast. I thought that was better than the 15 minute wait I have for hot water in the master bath shower, but there's a drawback; when I hopped in the other day, I thought the skin on my legs and the top of my feet was going to scald right off. I was afraid I was going to start blistering before I could turn it colder. That's no fun! Also, there is only a nanometer difference between scalding water and freezing water. Which is a problem considering the water steadily gets cooler and cooler as you take your shower, even though the handle is on the same setting. You have to keep turning it *ever so slightly* hotter just to keep warm water. Plus, delight of delights, the shower makes an unholy screeching noise for the first minute it runs, I guess until it reaches appropriate water pressure.

WHY HAS NO ONE EVER TOLD ME THESE THINGS??? I want your stay at Casa V to be the most pleasurable experience it can be, not a constant game of water torture! Please, speak up if something is like that, before another 3 years passes.