I am not sure if it's common to experience these nonsense issues but we had following issues:
1) We were locked in the unit due to doorlock issue. Wasted an hour waiting for staff to come and explain how to lock or open doors
2) Foul odour coming from Washroom. Is this common in Lisbon?
3) Last but not least (most important actually), we had an electric Wall outlet that caught on fire when we plugged in the heater. If one of us did not find out that it was burning, it might have caused serious fire. Plastic cap around the outlet was melted and the room was full of burnt plastic smell. Did not even get a sincere apology or reimbursement from the host. I will definitely not recommend this place to anyone and will never come back.