For small, intermittent cleanings, you can put a pot of water on the bottom shelf. Heat the oven to like 400 degrees and let it steam clean the interior. Then wipe it out afterward. For more stubborn stains, use products like easy off. It is formulated for non-self-cleaning and will work as a degreaser and lift the grease off the interior. Always wipe the oven out with a damp sponge before either method to remove crumbs and such.

So do you mean can you mix brand to brand? Or mix colors all together? I never have an issue with the stove being a different color as it is a focal point. Often, we do white, black, or blue, etc., on a stove with the rest of the appliances in stainless steel. If you mean brand-to-brand mixing, it’s ok, as long as they are not directly next to each other. Microwave and stove should match if the microwave is over the stove. No issue doing different brands. But just lookout as some may be fingerprint-free and others not, so those can go from dull to shiny finishes.

So front loaders have advanced a lot in recent years. Brands like GE now have the ultra-fresh vent inside and the micro ban material that helps eliminate bacteria. Many other brands added a fan and a clean cycle as well. The trick is always to maintain it by running a cleaning cycle once a week and wiping the gasket dry. A top loader will not have the issue as there is no door gasket to hold moisture, and it drains the tub 100%. If you want to go top load, look at LG 7300 or above units. They make a great top loader. No agitator will give you more room as well. However, I like the agitator action it moves the clothes better to get cleaner. Check out this new machine from LG. It is a top load super capacity 4.8 with an agitator. Best of both worlds! -Al

https://www.lg.com/us/washers/lg-wt7305cw-top-load-washer

So if you are still talking about standard appliance sizes. Even in a small kitchen, I recommend

30″ stove
30″ over the stove micro/hood combo
24″ dishwasher
30″ top freezer (bottom if preferred)
Utilizing the basic working triangle with the dishwasher next to the sink