We had to leave the apartment urgently because we were poisoned with carbon monoxide due to a defective gas boiler which did not comply with the standard (lack of combustion fumes evacuation). Despite what was stated in the description, the apartment was not equipped with any detector. The owner very casually considered that our symptoms, although very serious, were only due to the altitude of the city... All of this serious neglects almost cost us our lives. We were hospitalized for 2 days for examinations and treatment with oxygen. The rental amount has been refunded to us by Airbnb but we have no guarantee that the apartment has been upgraded to standard and secure, we have doubts that it will really be so one day. It remains in our opinion very dangerous and to avoid.