We spend 5 nights in Ana and Mariana’s place. The apartment is in the heart of Alfama so all the tourist attractions such as Miradouro da Senhora do Monte and Castelo do São Jorge, praça do comércio and Chiado were nearby - max 25 minutes walking. Taxis and Ubers service is also fantastic, which was quite convenient for us as we had a senior traveler. The apartment has everything you need for your stay and there are also many small markets nearby and a larger supermarket about 10 minutes waking (Lidl). The only remark I’d say if you’re traveling with seniors or with people with mobility issues (like we did) is that the area is very hilly (just like the whole Lisbon) and the apartment has no lift and a very steep stairs, so just be aware of it when booking it. The streets can be quite hard (and dangerous) to walk, especially when it rains! Also as many have mentioned, the flat is a block away from a south Asian neighborhood. It can look quite dodgy especially at night.
Overall communication with Mariana was great and we had a great time in Lisbon!