Anyone here know about vintage steel bikes?

[Popoki_Nui]

It's a 10 speed so 2 X 5. Downtube shifters. The crankset is a Sugino - it's pretty cool looking. Derailleurs are Suntour Cyclones. 700c wheels that are made by Ukai. The brakes are Dia Compe, but they need some help.

I have a friend who thinks this will be easy to clean up and get in working order. He hasn't seen the bike, but just from my description, that's his take.

Hoo baby! If you don't take this Miyata, can I have it? Others' comments about the DiaCompe brakes are valid; if you want to keep the bike close to original, try to find a set of Gran-Compe brakes. Made by DiaCompe, but MUCH better made.
By the sound of the component set, the frame may well be Ishiwata or Tange (formerly Champion) tubing.....probably butted. And man..SunTour Cyclone drivetrain???
The SunTour Cyclone (and Cyclone II) line was GREAT stuff....better than Shimano and as durable and functional as Simplex, Huret, and Campy.
If you have trouble reaching the brakes, you can try rotating the bars "forward", and moving the brakes up the curve of the bar until you find a comfortable spot. Or...a stem with a shorter reach.
For a little money, and assuming it can be adjusted to fit you well, this bike can be made into a real beaut. Good luck with it!!
Edit: don't forget to have the frame checked for internal rust. Light-to-moderate rust inside the frame tubes can be neutralized, then treated to help prevent further corrosion.