My mandatory criterias:

- I can speak the language and preferable have some contacts. Contacts don't have to be friends and Internet random people are fine, but they need to be locals to give me some information;

- The government does not have very stringent control over Internet. I don't want to have someone break into my door just because I reposted someone else's Tweet or voiced my concern;

- The city should have good hospitals, reasonably well public transit and other infrastructures. All public service should be of reasonable price to foreigners. They can and probably should be more expensive than the costs charged to the locals, but if it's 10x then it's too much.

- The local people don't dislike strangers;

- Crime rate is reasonable and I should not be afraid to walk after 9 p.m.;

- Living expense is lower than my resident country, otherwise it's just going to be a short vacation;

- It doesn't have large cockroaches;

Optional ones:

- It rains very little;

- It has public computers;

- It has a large electronics retail market;

I know some places that satisfy all mandatories except one, and some optional ones.