Honestly, take this account with a pinch of salt. It was almost
5 years ago and my memory of it is vague, so I will write rather
cautiously this time 
There were some tablets and offerings lying all around the
perimeter of the house, as much as I can remember. The whole place
was fenced then, there wasn't any possible ways to get in - except
by climbing over or squeezing through a dog hole in the
fence.
So we took the easier way and crawled through the hole in the
fence, naturally. I, almost forgot to mention that there were 4 of
us, and my eldest cousin was 30 years old then - I took comfort in
the fact that we had an adult with us and finally agreed to explore
the place with them.
We walked to the main door of the dilapidated house, past the
frontyard and all without any trouble. But as soon, as we opened
the main door... A fucking wave of rotten air hit us...
It smelt like there were a million corpses rotting inside, we were
reluctant to go in initially but curiousity got the better of us. I
don't know about the 2nd floor, but the first floor was a total
disaster... with animals slain, blood everywhere, graffiti on the
walls.. We didn't even walk a few steps into the house and we ran
the F out for the sake of our dear lives 