A writing space is as important as writing time.
When you have a special place where you write (I have a very deep, very dark, very scary cave, for example), you tend to write there just because you're used to doing it there.
Also, your headspace becomes attuned to your physical space.
I'd say, develop a whole ritual around your writing so it puts you in the mood. Kind of like putting on workout clothes puts you in the mood of working out. The same principle applies here. Drink the same drink. Eat the same food. Wear the same clothes. Sit in the same space.
And you'll get your writing done.
Plus, you get to put up a very scary sign on the door, something like "DO NOT ENTER. You might be bludgeoned to death for interrupting a writer. You've been warned."