I stayed here with my cousin for 3 nights and it was such a beautiful apartment to stay in. Well furnished. We were treated upon check in some Portuguese tarts, pastel de nata, which was a lovely touch and delicious! It doesn't have AC but that didn't bother us as the apt is generally at a good temperature throughout the day. There is also a fan to circulate air. The back of the house stays pretty cool.
We didn't realise the location of the apt, but that was our own doing for not doing enough research. To walk to Alfama was about 30mins, keep in mind, it is down hill. An uber to get around to Alfama was very cheap, about 4-5euros so we often did that. From there you can get a train to the beach and so on.
Communication with Sara and Paulo was very good as well :)