I have used Airbnb for our family travel for several years, and this stay might be the worse one.
The main issues are:
1.	The host will tell you there is no lifts in this building and the apartment is at 3rd floor, which actually means is that the host will not come with you to the apartment, and give you an introduction. The host just give you the keys and tell you there is an introduction book in the building, which ideally will be OK, but if the information in the introduction is not correct?
2.	When we went into the apartment, there is only one heating radiator working, all the others are not working, and then around 7pm, this only one stops working. So here are what we faced:
a.	We checked the introduction book, it says there is a digital controller on the wall, and we could not find it anywhere, so we emailed, texted to check how to get the heating on
b.	After two hours, the host replied and said we shall turn on the radiator, come on, we are not stupid, and we have checked this already, and none of the radiators were working
c.	The host said the digital controller mentioned in my introduction book is not right, there is NO this kind of thing in my apartment, and there is no explanation about why it is in the book at all
d.	The host said they are sending the technician to check the reasons, this is the last communication I have from the host until the following day 11am when we checked out, and you can image, NO heating at all for all the stay.
e.	During the night without heating, the temperature in Vienna dropped for almost 10 degrees as the cold air is coming with 50mile/per hour wind outside.