There are tons of papers available that would go with your midcentury home. Many people tire of a paper quicker than they are ready to redecorate and they can also look dated in a couple of years. Metallic papers were big im midcentury...perhaps a metallic silver paper? Are you also considering paint? You can get it in so many textures and a blue wall to match the blue in your loveseat would be lovely with some midcentury art and sculpture, or photographs on it. A mirrored wall with or without art or sculpture would also work with midcentury. These treatments are easier to adapt should you wish to change the look slightly from time to time. I would suggest replacing your stairrail with chrome or acrylic if that is in the budget...see how well the loveseat frame looks with the fabric? I hope you will post the "after" photos for us to see. Above all, enjoy the process!

Paint a bright light color (maybe a gray with a green undertone to coordinate with the tile) and add a floating shelf and mirror for a place to drop keys and check yourself going out..

Thanks :) Yeah decided to go with tile. So sand cement is ok over existing tiles if I prep them first? Only problem is, the new pad can only be about 30mm at it's thickest (leaving up to 15mm for tiles) otherwise it'll end up being higher than the hallway floor. So I either need to make the fall shallower or not bother with the waste and make it all level. If I made it level, could I use levelling compound at that thickness or would deck mud/sand cement be the best option? Also, should I be putting in mesh for strength? (I know I should (and will) ask the local hardware what they suggest, but it's great to have suggestions from the Houzz community also)

Thanks for the extra pics. Still thinking along the same line. Trim the bushes by the sidewalk to make the sidewalk more visible and accessible. If you can, replace the package with new door with clear glass or no glass and new sidelights or none. Put in a courtyard that comes out to the white wall with whatever works for you. Pavers, pavers and gravel, low decking, concrete, tile, brick. Anything. Add bench , chairs , mini trees in pots flowers. Make it welcoming. Could even add a trellis over the area. Deck could be made smaller and planting beds put in under Windows for small shrubs or flowers. Grass in the area between the ac unit and the driveway. Add a walk way from drive to the deck in material that works withe the rest. I would add pictures but don't know how.