We had a great stay at Diogo's accommodation in June '21. The location was very good, about 10 minutes' (stiff uphill) walk from the city centre and with several small shops nearby, and bars and restaurants close by .. and the nearest restaurant has a Michelin plate, for those wanting something a bit different. The location is a couple of minutes' walk from the castle.
The apartment itself is very nice with everything we needed for a week's stay. There is a small garden, which is a great facility for relaxing and unwinding. Do note that the apartment is on 3 levels, with a very tight spiral staircase between floors, which might be difficult to navigate if you don't have great mobility. Also, the staircase going into the lowest floor (kitchen) and the door out into the garden are not exactly friendly to taller visitors (1.85m visitor here).
Diogo is a very helpful and pleasant host. He provides A LOT of information on local services and, since it we visited in Covid times, information on ever-changing rules and restrictions, as well as providing sanitiser for use at home and out and about.
In June '21 there was construction nearby, which Diogo informed us about, but even though the crews created construction noise, it didn't really bother us.
When we return to Lisbon, we'd stay again, if available.