The oven - deep or high ...

I also find it practical in young years. We decided on a dishwasher downstairs in the corner. If it still dries a bit, you can leave it open without it being in the way. I think – as always – it depends on the overall planning.

I would rather consider installing the dishwasher upstairs, since it is used several times a day and not just every few days like the oven. If you have enough space, you can of course have both placed upstairs.

Both upstairs.

I also find that practical at a young age.

One does not exclude the other. But at a young age, it hardly matters because the body tolerates a lot.

Above and I personally would also only buy one with a side-hinged door. We have had that for several years now and don't want to miss it anymore. Of course, there aren't many models that have that, but I think it's worth it.

would only buy one with a side-hinged door.

What advantages does the door have?

Oben und ich persönlich würde auch nur noch einen mit seitlich anschlagender Tür kaufen

In contrast, oven with Slide and Hide door, when built high...