Kharkiv, Ukraine: university town, lots of IT companies and meetups, cold but not as cold as Moscow or Estonia, very cheap prices, US/EU passports get 90 days entry, visa-free.
There is this whole Russia thing (we're 50km from the border), so if that's a problem, try Kyiv or Lviv or Odesa.
There is this whole Russia thing (we're 50km from the border), so if that's a problem, try Kyiv or Lviv or Odesa.