Jaco is a busy place with night life, younger people celebrating whatever, etc. Pueblo Real is very quiet, closer to Manuel Antonio National Park, and more spacious. It is also about 5 km from Quepos proper, but you can get anywhere you want via inexpensive taxis that the front desk at
PR will arrange for you.
I have stayed there several times and I am going again for 4 weeks in January. PM me if you have specific questions.