We stayed around 2 weeks in Luis apartment and really enjoyed the time there. It is quite small and a little bit dark, but nice for one person or a couple. The wifi was really fast so it was easy for us to work from the apartment. You can easily walk to the Time Out Market and with public transport also parts like Belem or Alfama are not far away. Some parts of the apartment are a little bit old, but I would guess thats the nature of old buildings anyways ;)