The software Space Engine gives you the opportunity to fly to many massive objects in the known universe. You can virtually go to the polar areas of the moon and search for a nice spot for a permanent observation of the earth. Most of the upcoming missions will go to the south pole, while water depots might be bigger there. I'd prefer to go to moon's north pole, while earth would be visible facing north on the top of the picture. With Space Engine I found a nice spot close to Hinshelwood crater, that gives you the visiblity I have rendered in my videos. The spot would be: 88°50'48" North and 63°44'48" West: