Collocations for comfortable - adj.

be, feel, look
The bed felt comfortable.

make sth
We must think how we can make the room more comfortable for you.

extremely, fairly, very, etc.
incredibly, wonderfully
an incredibly comfortable chair

perfectly
enough, moderately, reasonably
The hotel was comfortable enough.

surprisingly

change into something more comfortable, slip into something more comfortable
I'll change into something more comfortable when I get home.

be, feel, look
Did you feel comfortable and relaxed at the party?

become, get
This bed is lumpy—I just can't seem to get comfortable.

make sb/yourself
Make yourself comfortable!

keep sb

very
completely, entirely, fully, perfectly, quite, totally
I was not entirely comfortable about the plans they had made.

increasingly

about
She didn't feel comfortable about going out alone.

with
I don't feel comfortable with him.

comfortable in your (own) skin

be

very
quite, relatively
I had a relatively comfortable life in Brazil.

Comfortable is used with these nouns:
accommodation, apartment, armchair, atmosphere, balance, bed, bedroom, chair, circumstance, clothes, clothing, confines, couch, distance, environment, existence, familiarity, fit, flat, grip, home, hotel, house, journey, lead, lifestyle, living, lounge, majority, margin, mattress, niche, position, quarter, retirement, ride, room, seat, seating, settee, shoe, slipper, sofa, stay, suburb, surroundings, victory, warmth, win, winner