Police call handler request.

The person ,
who answered your call is so irresponsible.
What an incredibly stupid idea -expecting you to pop in to check .
Anything could have been wrong .
Even if you were a superfit 20 year old -a burglar could have jumped out and attacked you .
It's not exactly reassuring that your concern wasn't addressed for five hours .
Imagine if the gentleman had been unconscious .
It doesn't bode well for the future ,does it ?

Police would not have entered the building alone, expecting a member of the public to do so is wrong.

You did the right thing by staying put.

I know it sounds gloomy and dramatic, but it could have been a crime scene, you might have walked in to the man sprawled out with a knife in him, so you also might have been in danger.

I appreciate your concern for your neighbour!

This happened to me many years ago, when I lived in my house alone except for my two dogs. I came home late one night and fell asleep on the sofa leaving the two dogs sitting by the wide open door. I awoke to find my neighbour accompanied by a policeman standing outside the garden gate wondering if they dared come into the garden past my German shepherd and my collie at the front door .

Then you did the right thing Dee1012.

Patsy70, if it was a house I would have done so but the flats have a layout with the front door and then a rather steep flight of stairs to a long hallway....the kitchen and rear door are to the end of that hall.
If anyone was there (that shouldn't have been!), your exit could easily be blocked.

No, you’re not being unreasonable, due to your circumstances. However, if it was me, I would have gone to see if anything was amiss, before calling the Police, clutching my mobile phone!