As far as I know most people are just curious (I saw my first black person when I was 11 years old, so yeah, mostly white country). There is racism, sure, especially in less-developed parts of the country, but most people just keep to themselves and don't ever express their racism. I also don't know of anyone below 30 to be racist. It's mostly old people from the soviet times (where there were virtually no people other than of colour white around).

As far as is it a good place to live, well, it's cold (but very tech-advanced). Check out https://e-estonia.com/

You'll be hard-pressed to find the sort of systematic racism found in the US (especially by institutions) anywhere in Europe. Sure, you might get the occasional glance if you are black especially in Eastern Europe and it's mostly because out of curiosity since there are not many African immigrants in ex-Communist countries as there are in, say, France. But other than that you'll be fine.

I should say though that Eastern European countries do have issues with Islamophobia in general, so if you are muslim I would not recommend those countries.