I have an 80s Raleigh Record converted to a single-speed. I do have a flip-flop hub, and I tried fixed for a while. Fixed is different, but caused me knee pain. I still enjoy the simplicity of single-speed though. My single-speed is becoming my primary commuter bike.

As far as "road bike", yeah, mine is an old, lugged-steel, drop-bar, road bike. Being from the 80s, I can fit 700x32 tires (converted from 27" wheels) and fenders. It makes for a comfy ride, and no skunk-stripe.