Thanks for playing!
This is a difficult one. I don't think it's worth having both a 'Return to Bedroom' and a 'Map' button on the top UI, especially since the map is one click away from the Bedroom.
On the other hand, I see your point that it'd be nice to access the map from other locations. At the same time, you often need to sleep/progress time after completing a scene in town, which requires you to be in the Bedroom.
For now, I think keeping it as just the 'Return to Bedroom' button is best. However, if I think of a suitable way to include both without cluttering up the top UI, I'll take another look :)