be at home; make feel at home (o-english.com); feel homey; feel homish; feel homy; make oneself at home (Relax, have a cigar, make yourself at home. (Sting)); be on home ground (Anglophile); be on home ground (Anglophile)

Игорь Миг

know one's way around (Моей дочке десятый год пошёл, а она в лесу как дома – My little girl isn't even 10 years old and yet she knows her way around the forest (Michele Berdy)21); feel completely comfortable (Достаточно посидеть с моей соседкой две-три минуты, чтобы почувствовал себя как дома, как будто вы давно знакомы – It's enough to spend two or three minutes with my neighbor to feel completely comfortable, like you've known her forever (Michele Berdy)21); make oneself at home (Наглый пёс расположился на моей скамейке, как у себя дома – That cheeky dog made himself at home on my bench (Michele Berdy)21)

idiom.

feel at home (markovka)

Makarov.

feel free

чувствуйте себя как дома

gen.

consider yourself at home

amer.

be my guest (Would you mind if I look around a bit? Be my guest. Val_Ships)

inf.

knock yourself out (Taras)

Makarov.