ESTJ - They're hard-asses. I love it. Very no BS kind of people that can get the job done no matter what.
ISTJ - Hard workers, and great for doing the long, tedious jobs that nobody else wants to do, and they actually seem to enjoy it. Also no BS kind of people. My dad is one and I think he's one of the greatest people in the world. I envy his work ethic.
ESFJ - They'll always take care of you, especially if you're they're friend, and they'll be quick to defend you if need be. I used to have a best friend who was an ESFJ, I believe. She threw the best parties.
ISFJ - Would bend over backwards for you. They're usually genuinely concerned about how you're feeling. They also will never leave anyone behind. My fiance is one and I admire his compassion. He once said to me, "I'd rather sleep outside in the rain myself than kick someone out of my house, even if they're my enemy." I don't understand it, but I like the way it sounds.