We chose pia's place for the start of our honeymoon and a terrible beginning! we arrived at pia's place at 00.15 a.m. We were already very tired after a flight with a stopover. One of the pia's employees and a cleaning lady met us and said they forgot to clean the apartment and we had to wait for one hour for the cleaning to finish. When we made reservation late checkin after midnight was 50 euros and the employee wanted to charge us 50€s for late check-in but no solution about cleaning after midnight. We said we had already paid for the cleaning through airbnb and we offered 30 €s but she said she was only an employee and her COMPANY should solve that. And also she advised us that we should have arranged our plane tickets accordingly because she is very smart! Employee left after half an hour and probably UPDATED the rules as:
"Check-in from 12PM on (although it is possible that the apartment still has to be cleaned)
Check-out until 11 AM

Late check-in fee:
after 9PM: 30 €
after 1AM: 50 €"

Because the greeting girl was just an "employee" she did not give any information about neighborhood, barcelona and even wi-fi password. airbnb called us about the problem offered a solution and we stayed at the place because of the limited time. Pia messaged us back approximately 12 hours after our arrival but it was too late.
You can stay at pia's place although it is possible that the apartment still has to be cleaned , although pia may not be there, although employee may not tell you anything about the house and the neighborhood, although the rules may change any time.