Pallas’s cats are nice to look at but they are not nice to live with because they are not acclimated to living with people or to put in a better way they are not socialised to live with people. Therefore, you will be living with a wild cat albeit a small one. But small wild cats have the same temperament and character as the big ones and therefore they are likely to scream at you and spray urine all over the walls because they’ll be very insecure and scared.
They are likely to be impossible to deal with as they crave to get out of the human environment into the wild world where they came from. The question as to whether Pallas cats are nice must be a preliminary question about whether they can be domesticated and whether you can live with them. And I am one of those people who believes that you should not try and live with a small wild cat because they are far better being left in the wild where they can behave naturally. No doubt they can be domesticated to a certain extend but you won’t end up with a true domestic cat; nowhere near it.

One of the difficulties with the Pallas cat is that they look rather cute with their long fur. They almost look like domestic cats (the Persian?) but their appearance is misleading. I don’t think that you will find anything on the Internet that is useful about domesticating Pallas cats and living with them so if you were thinking about it, I would drop the idea.
In any case there are far too many young cats being stolen from their mothers in the wild and taken to the West or the Middle East as pets such as cheetahs. It’s time to stop this obnoxious trade in wild animals including cats as pets. It’s a bit sick and it is totally against conservation for humankind to have that kind of relationship with wild cat species.

The more scientific name for the Pallas cat is the ‘manul’. Also ‘Pallas cat’ is incorrect. It should be ‘Pallas’s cat’ after the scientist who discovered the species: Peter Simon Pallas in 1776.
Note: there is no connection between the manul and the Persian cat by the way (the link is a quiz on the origin of the Persian cat). None whatsoever.
There is no more to say but below are some more articles on the manul.

Pallas’s cat is NOT endangered generally the experts say

Pallas’s cat lives at the highest point above sea level of all the cat species

Can Pallas’s cat successfully mate with a domestic cat?

Pallas’s cat in snow warms up their forepaws by placing them on their tail

Pallas’s cat has the densest fur of any cat in the world

Note: sources for news articles are carefully selected but the news is often not independently verified.