I hate to leave negative reviews but in this case i feel obliged to do so. WE had to vacate the apartment after 2 nights (of a seven night stay) due to the overpowering smell of the drains. The owner was unable to do anything about this and blamed it on the "river level". I was forced to check into a Lisbon hotel for the remainder of my stay at considerable extra cost (there was no alternative airbnb aparment available at short notice) . Th owners refunded the unused part of my stay.
Otherwise- the apartment is well located in Alfama . The stairs are extremely steep as others have noted. There are a number of other faults. In the downstairs bathroom (which adjoins the kitchen ) the door doesn't close!, the toilet flush is broken and the basin has no plug. These are thngs which would easily be fixed but the owner hasn' t bothered. Im sorry to say this was my worst experience on airbnb.
The Airbnb support team however were very helpful.