First the positives - this was one of the BEST views I have got from any of the hotels or accommodations I have stayed the world over! And (though many travellers may not prefer it), the quaint narrow bylanes in which this apartment is situated had their own charm - for a traveller like me who was interested to see the 'old city'. So full marks as far as the location goes! Also, the guest was respectful and the place was clean!
Now coming to the issues I faced:
1) The color of the building had changed from the photo / video which was shared after the booking, so was not able to find the building faster.
2) The by-lanes were so narrow, that no car/taxi could go inside the lane, so Uber left me at a considerable distance from the apartment. It should have been informed for a guest who was going to check in with a large suitcase - I had to carry it through those slopes up and down multiple times when looking for my destination.
3) While looking for the apartment, I tried reaching out to the number shared at the time of booking, but nobody picked up, so did not get any help from the host in finding the accommodation - had to hunt for it by asking help from the bystanders.
4) The (extremely) narrow stairs were almost impossible to take your suitcase up (I had a very normal size luggage allowed by airlines for checkin). I somehow managed to take my luggage up by adjusting in various positions and dragging up.
5) The bathroom was extremely small as many travellers have already said - that, however, was the least of my concerns since I was there to see Lisbon so used it only a couple of times.
6) The window behind the bed had a street light shining on me all through the night. The thin curtain provided did nothing to block it - so was not able to have a sound sleep.