This is very hard to stain maple , it will not stain even. You should buy some kiind of primer befor the stain and that might help. On my
floors I use water poping this is just an extra step before staining I wet the floor with rags damp in cold water , if you decide to do it make sure you do it with all your windows becuase that water poping is opening the woods grain and that helps the stain to take it evenly and will get the wood darker then just staining it without water poping.remember this is not easy anyway to sain it nice. You could use just clear finish and the Maple will look great.
Good Luck