The apartment was adorable for our 10 day stay. It is near the Sao Jorge castle and is quite a climb but as Lisbon is a city on hills we actually enjoyed the location. If you don't like walking uphill you can always take the train. There are nice restaurants and cafes nearby!
The layout was a bit different than we were ecpecting from the photos but we had everything we needed. And if we felt that something was missing the hosts solved the problem asap.
Only thing I would bring out, there are roosters near the apartment. If your sleep is light then take earplugs with you because they started already 4-5 am :)