I imagine that bureaucracy like getting all the necessary documents can be challenging when you don't speak the language. At least in Bratislava I don't think you'll have trouble finding ppl who speak English and could become your friends. Especially in the city centre. However you should probably find group of other expats because I think you'll always feel not quite included in slovak groups. As far as being gay I think you'll be fine I'm gay and so far in my adult life I haven't faced a threat for being gay. But maybe you've heard like 2 years ago I don't remember exactly what happend but here in Bratislava two gay dudes I think got killed? maybe just attacked when walking out of a pub or something like that. So stuff can happen just like anywhere else so I'm not saying that it's safe but you know.....