I believe my response is also valid. Krislo can be an armchair or a chair.
I have to agree because i have never said "Hey, get your big butt out of my armchair."
Looking at Google Images of chair, стілець and крісло, I would say:
chair -> стілець, крісло; armchair -> крісло
And conversely крісло-> chair, armchair; стілець -> chair
Will make it like this everywhere :)