Like Eden, I am very short (5' 1"), with short arms and torso; my main bike is a men's Kuota Kebel in an x small (48 cm), with Specialized short/shallow bars and Ultegra short reach levers, 165mm cranks. It feels quite comfortable compared to other bikes I have been on. I also still need a teeny stem. So, while it's a little twitchy, I feel really comfortable on it. I have a new custom Guru road bike, which has a more relaxed geometry... no more teeny stem, but I feel way too upright. In fact, I am going to move the position of my bars, so I can be in a more "aggressive" position.
I'm not an "aggressive" rider, but this is what I am used to and what my body likes.