Health/medical resort

Hi, what sanatorium/uzdrowisko do you recommend? I am a student and going with my grandma. I know polish language very well, but she is Ukrainian that doesn't know a lot of polish. We will deal with it together, but most importantly I just want to find a good place where there won't be any disrespect from the staff, because she is Ukrainian. I know it can happen anywhere, but if you know anywhere where is a great resort or the one we should not go to I would be grateful for any information.

Also please tell if we are required to do any blood tests or stuff like that before coming to the resort

Thanks in advance!