We booked this apartment for a week but couldn't spend more than 30 minutes inside. On arrival it looked clean and newly renovated, but a cigarette/nicotine odor was noticeable throughout. It wasn't just lingering smoke; it seemed embedded in the walls and furnishings, strongest in the master bedroom. Every window had been left open beforehand, partially masking it. The host suggested someone smoked outside and advised us to close the windows and run the air purifier.After 30 minutes we developed headaches and left. The host's cleaner met us there later and said it smells like itself and that he just wouldn't describe it as cigarette smell.The next day, a member of our party with asthma wanted to judge for themselves, out of fear of losing our money, thinking we could just deal with it. We let the host know beforehand out of respect, though our reservation was still active. With the windows closed, the smell was now stronger than before, prompting an itchy throat and inhaler use within 10 minutes. We couldn't compromise anyone's health, so we requested a refund and stayed at a hotel instead. Hours later, the host canceled the reservation with no refund and accused us of trespassing.Past reviews describe the same recurring odor, and the host's response has been the air purifier. This place needs real remediation. We travel often and have never had such a disheartening and exhausting experience. Not recommended, especially for anyone with respiratory concerns.