The barbell row is great for building upper back strength and size, and it's also a great accessory lift to improve your deadlift. Here are a few tips and cues:
Start with the bar on the floor. This will make the row have more carryover to the conventional deadlift.
The bar should start directly over your toes. Stay tight and lift the bar about an inch off the ground to begin.
Pretend you're squeezing an orange in each armpit. This will keep your lats properly engaged and keep your upper back in a good position.
A little swing or body english is okay for advanced athletes lifting a lot of weight, but master the strict form first.