С МИЛЫМ РАЙ И В ШАЛАШЕ (saying) when you are with the one you love, you can be happy in any place, any living situation (even if less than ideal): = a cottage is a castle for those in lovelove makes a cottage a castle.
Через три дня они поженились. С милым рай и в шалаше. Ей было восемнадцать лет, ему двадцать. Поселились они в крохотной Димкиной комнатке на пятом этаже, которую он снимал, поссорившись с отцом, крупным инженером (Некрасов 1). Three days later they were married. A cottage is a castle for those in love. She was eighteen, he was twenty. They settled down in the minute fifth-floor room which Dimka had rented since quarreling with his father, a famous engineer (1a).