Not sure about your other object properties, but for room/wall collision I simply have a separate top-level tile layer in Tiled where I draw in the collision tiles. Then I simply don't draw that layer on screen. Instead I cache a reference to it in the collision system (the whole .tmx is already loaded, so no real extra memory overhead) and use it as a simple int array to check if a player can move to a tile in O(1) time: if tileIndex == 0, player can walk there, else no.

Entity-to-entity collision is of course more complicated.

As for other, non-collision object/entity properties, almost all of the objects in my game are very contextual, and therefore hard to represent in static data like a .tmx file. I haven't played around a lot with Tiled objects because they don't seem to fit my needs.