You could fit it out with narrow shelving unit that is flush with the doors, ie. rest sits inside wardrobe. So has that build-in look. Light the shelving for display pieces, or not. Use to house a sound system. Some shelving units come with a glass door which would be good for display items. Or fit shelving with a push hinge door and use as additional hidden storage. Or as a shoe cabinet. Or do a series of small floating shelves that come out into the room if that's practical. You can get some with pull out draws. Otherwise, mount a LED light panel or backlit wall panel art?

We have the same layout as you in our 90s spec built home. We have Bunnings type cavity sliders so I imagine ours are about as cheap as you can get. They are awful - they are noisy when they slide so if one of us gets up in the night for the bathroom, we have to open the door in slow motion so as not to wake the other one up! We have them on our other wet rooms through the house and I find them not too bad acoustically but they don't screen anything in the ensuite. I would not recommend them at all. As for whether to have 1 or 2 doors, the only time I close the WIR door is when I am at my wits end haha! It's a great space for a private phone conversation but I really couldn't be bothered closing the door any other time

The problem is you've got freestanding furniture where a built-in solution would have been better. It's always going to look like free standing furniture. To improve the look the cabinet in front of the fireplace needs to go entirely. You can then build shelves onto the chimney brest to meet the front of the wardrobes but those shelves aren't going to be anything more than picture rails. Doesn't matter what wood you use because you'll paint it the same colour as the wardrobes. It's an awkward solution. It would have been more cost effective to have the wardrobes built in either side of the chimney brest, full height to meet the ceiling with mouldings that matched the rest of the room. You could have then decorated the chimney with a large mirror and it would have looked 100% better. As it is I would just have the two wardrobes there, get rid of the third and leave it at that.

Actually, your style isn't really very scandi in my opinion. It's industrial and rustic. I'd match recycled and chunky timbers with the concrete, a timber with rich reds. There is a company near me that makes plywood panels with recycled wood veneer attached. They're too far for you but might give you some ideas for a feature wall. I'd start with a few tins of paint and some colour actually. you'd be surprised what that can do! I'm fixing, well technically my second home but with our first we figured fairly quick it wasn't a forever home and didn't do anything personal with it. So this is our first "home" if not our first house. i getya! I know everyone seems to love white walls, but after years of bland rentals the first thing I wanted to do was paint colours all over the walls! Anything but white! Paint is cheap and a safe place to start testing your design flair. Go and paint a bunch of sample tins onto the walls and don't stress too much about the perfect look. start with what you like and find what suits that. A colour that makes you smile when you see it. I've paid about $10 a sample tin. like others said, don't do anything with the carpets yet, you can throw a rug over it if its too boring and it will look fine. There are so many things that I first thought I needed to completely change, then as I painted and freshened and tidied up I realised were not needed a huge reno. Our house was a bit of a wreck though, not a nice new apartment so things just literally needed cleaning and fixing. Put up some pictures, art, photos you like too. Honestly, I know everyone's being funny about getting a girlfriend and getting her to decorate, but actually I think it's great you've got your own taste and want to decorate. I think anyone you bring home would love seeing more of your personality around the place. Check out some garage sales and buyswap sell and auctions for rustic timber pieces for your home. Maybe a nice pipe and timber bookshelf in the lounge instead of an entertainment unit? https://www.northernriverstimber.com.au/