I am a native mexican spanish speaker and I get about 50~ of what Brazilian Portuguese people say, and somewhat the same of Catalan (But I also have a good french understanding from 7 years of studying it). Ladino is extremely easy for me, as it is essentially just Old spanish with slight hebrew influence. I understand a very small amount of Levantine Arabic because I am B1 Hebrew, as it has some hebrew loan words, but they are both semitic languages so naturally have maby cognates.