In and At – At
My mother is staying in 66 Argyle Street.
My mother is staying at 66 Argyle Street.
We use at when we’re talking about an address, a public place or building (a bus slop, the Post Office, the library etc.) and cases in which the location urelpt’dnt but wtat we do there is v.twl mailers (school, the dentist, dance class etc i