I stay in / I stay at
in/at
It depends on what follows, like for instance
I stay in a hotel
I stay at home
I stay in a hotel
I stay at home
A better example would be:
"I stay in the house."
"I stay at the house."
"I stay in the house."
"I stay at the house."
"At" simply refers to the location. "In" provides the additional information that you are "inside" something (e.g. a house).
Cf.
1. I'm at the Dorchester Hotel.
2. I'm in the Dorchester Hotel.
In #1, I might be inside or outside the hotel. In #2, I can only be inside.
Best wishes,
MrP
Cf.
1. I'm at the Dorchester Hotel.
2. I'm in the Dorchester Hotel.
In #1, I might be inside or outside the hotel. In #2, I can only be inside.
Best wishes,
MrP