We visited at the beginning of April for 7 days. The apartment is in a good location if you are wanting to be within a central location in alfama and close to the famous trams, some nice places to eat nearby. However, it was very noisy some nights and on one of the evenings there was a party in the floor above us so we had difficulty sleeping.
One other concern was that we had no contact from the owner whatsoever. I reported an issue with the broadband on the day we arrived and never received a response in the entire duration of our visit.