I am quite sure but not positive that this plant is Ixora coccinea. It is very commonly used as an ornamental flowering shrub in tropical and subtropical landscapes. As a houseplant, it will require direct sunlight- a south facing window and as close to the window as possible. In nature they prefer full blasting sun. Keep the night temps above 50 degrees F.
It will not bloom heavily in the depth of the winter- day length too short. Due to lack of natural predators, it will be susceptible to many insect problem kept as a houseplant including scale, mealy bug, and white fly.
It will benefit greatly from being kept outside in warm weather months and fertilized regularly during the active growth periods of May-September.