I assume, for Samir, he went to study abroad, achieve many things to start his “not-regular” life. Although he could saw his colleagues, relatives maybe, getting married, may be have a a baby. And he start feels that he missed something. That`s because he is not finding the balance for not-regular life he want to have.

For your read-head fried, Marianne, I am sure she is magnificent. And Marwan could fall in love with her for no reason. Actually one can imagine a reason when he fall in love.

Anyway, for the microwave 😀 She could be meant that he is ready for marriage and commitment, he finished furnishing his house, he even brought what she consider an accessory, a microwave. may be.

She is may be trying to fill the gap between her brother and “the foreigner” Mariane. and she is thinking that she is presenting the same life-style Marianne would love to have or keep.

She is surely direct and simple person, she is honest, and she entered the phase of telling even such a detail in a wrong way to convince, convince her to think at least about her brother.
The microwave is not a prerequisite for marriage, but it is just one of items the sister thinks is ready to be used by her brother and his wife.

Regards