In my experience. I didn’t like Murena. I used it for a while (I think 6 months. I don’t remember well). And yes, it’s “ok”, but the interface is a bit broken.

The good thing is that there is a lot of software you can use there: OnlyOffice, NextCloud (much of their software), Searx and even Gitlab are there.

Another thing: if you like SMPT and IMAP, the Murena account offers you this. I prefer Proton, but it a good option too.

These formats are overrated. MM/YYYY/DD is clearly better.