Szimpla is a ruin pub and like nothing else you would find in Britain. As others have said the place is quirky, full of junk as furniture and graffiti on the walls but it is phenomenal!
It's a large pub over two floors with covered and uncovered outdoor areas. There is a projector screen outside on which you can watch old films whilst sitting on a high lifeguards chair, gym apparatus or even cinema seats.
For two drinks it ranged from £3-5, which is reasonable.
Tip: Go at night to get the full effect. All the nooks and crannys are lit up and there are also shisha pipes to be enjoyed whilst kicking back in a bath tub.
Take a pen and scrawl a message on the wall.