There is something very not accurate with the description on this apartment: it does not have a sofa bed! It does have a sofa, but it is not turning into a bed. For that matter you may say there's a table bed or a floor bed - not every object you can place a person on horizontally may be listed as a bed. My kids ended up sleeping on the sofa cushions, which isn't what we paid for. We contacted the owner, who said they will supply us with a mattress but eventually didn't.
One more problem was the stench in the stair case. I understand this isn't the responsibility of the owner, just saying, maybe it will help someone...