No, I haven't needed to service the washer or dryer at all. (It probably helps that I bought Mieles, as they've been trouble-free little workhorses. I'm opinionated about buying as much quality you can afford at the outset, to avoid problems later on, which has served me very well in this instance.) As far as accessing the dryer vent, I haven't actually ever done that. It vents down through a crawl space and out the foundation of our house. (You make me wonder however if it's time to go check on that, to see how much build-up there might be.) I don't seem to get an overabundance of dust, and am pretty meticulous about keeping the mesh lint screen cleaned after every dryer load, so that's probably helped. The washer is a tight fit, but can be moved. We need two people to actually pick it up (a couple of inches) to move it out, but have only needed to move it once in the time it's been there. (That was in the beginning when I had the sheet metal pan made, which took some time to procure and set into place. I also went the extra mile and bought metal mesh supply lines for peace of mind, knowing that moving the washer or dryer would take some planning!) The turn-off valve is at the back of the washer (behind the laundry basket) and rather hard for me to access as I'm short and don't have long arms. The Mieles are deep, rather than wide and because of this, I keep a step ladder (just in case) at that end of my home in my closet, so I can reach it quickly if the need ever arises. Hopefully it never will, but I did plan for the eventuality. This is absolutely some of the best space planning I've ever done. I can't tell you how easy it is to deal with laundry at this stage of my life...you'll just have to experience it yourself! If I ever have to move from here, I would repeat every detail exactly as is, in a heartbeat. Good luck!

If you do laundry (washing & drying) with the doors open then I don't see a need for them to be louvered at all. If you do run the dryer with the doors closed, then yes, they must be louvered. Dryers pull a lot of air and must "breath" freely. Check with your user manual for "closet installation" for the washer & dryer. I just checked with an Electrolux manual and it states: "Closet door ventilation required: A minimum of 120 square inches (774.2 cm�) of opening, equally divided at the top and bottom of the door, is required. Openings should be located 3 inches (7.6 cm) from bottom and top of door. Openings are required to be unobstructed when a door is installed. A louvered door with equivalent air openings for the full length of the door is acceptable."

i dont see an issue with full louver. and i like that i can put plastic S hooks on the inside, hanging on a louver, for lightweight accessories.

I agree about bifold doors...if not necessarily flimsy, they are awkward to operate and don't fold out of the way enough in many applications. I love your idea of the partially sliding in doors and would pick that solution myself. I don't think you need louvered doors either, they are a pain to keep clean and what kind of ventilation does a washer/dryer need? None. I'm not sure if any of the previous links go to this source, but they have a great selection for what you want, up to 110 lbs: https://www.richelieu.com/us/en/category/sliding-system-solutions/sliding-solutions-for-cabinet-and-furniture-applications/hawa-concepta-series-pivot-and-slide-in-pocket-door-system/1206997?nf_1031396=%281764651%29