A straight staircase is the simplest staircase model. It is slightly more space-consuming than, for example, an L-shaped staircase. Keep in mind that the ceiling height and the size of the opening will be what determines if you have the required clearance (i.e. you can take a few steps up the stairs and not hit your head in the ceiling). The staircase can usually start a step or two outside the opening and you can walk in it without hitting your head. But always check these measurements and make sure you have enough space. If you make the opening larger than the staircase, you don't have to worry about the clearance.
The stability of different railings can feel different in a straight staircase. In general, short railing sections, divided by a pole as the most stable.