Our friends stayed with us a couple nights, a chill visit, multiple cooks (and cleaners!) in the kitchen, kids milling about, outings and laughs. They were AMAZING house guests, so thoughtful (brought us Bulgarian goodies), helpful (cooking, bed making, pulled linens upon leaving, etc.) and just felt like we'd been friends (or even family) forever. Being in the same work/life overseas environments maybe helps with learning the unspoken book of etiquette, but I think they are just great people and would've done all this regardless.