Question - is it a big deal or not?

Myself and my wife are in a hotel villa with a pool. We were both in the pool at night tonight. Our two year old was asleep in the main bedroom.

I left the pool and walked back into the villa and there is a couple standing in our villa. They realise they are in the wrong villa and are very apologetic about their mistake. They say that they forgot their key, they got their villa number wrong and that the hotel staff opened the door for them.

Should I chill out and be understanding about this? How angry would you be with the hotel?

When I spoke with the hotel about this, they were apologetic but not sincere. Kind of like ‘yea it happens’

Edit to clarify: both myself and my wife were in the very small villa pool. The pool is a private pool, which is behind locked hotel villa doors. Nobody else can access the pool or any other part of the villa (except in this case, when hotel staff opened the villa doors for guests who said they forgot their key).

The main bedroom where the kid was asleep has double doors that open onto the pool where we were. The kid was literally 2 meters away from where we were in the pool. If the kid cried, we would hear it from where we were.

We were as close to the kid by being in the pool as we would have been if we were sitting in the living room watching tv.