The area of Stockton that your project is in is an older very established neighborhood! So, be sure to keep all remodeling as much as possible looking like the way it was built. It is sort of like restoring an automobile (don't change the original looks). The most important rooms are the kitchen and the bathroom. Spend most of your time and money in those rooms.
The property is located near Victory Park; which is an area where it is really hard not to do well! Location, Location, Location.
Typically your "best bang for your buck" is in the kitchen and bathrooms. But I would also look at other things like your windows and flooring. Here are two great articles which give you ideas on best upgrades and what a typically upgrade would cost.
I hope that helps... :)