Loved it!!
António was very helpful and from check-in to check-out everything went smoothly.
The flat is even bigger than I'd have expectec from the pictures and it is such a lovely place! The area is great too - you can walk into town within 20 minutes or you can take the famous tram (there's a stop right around the corner). Everything you need is nearby (little shops, a pharmacy, bigger supermarkets, pastry shops..) and one of the best seafood restaurants in Lisbon (which is also one of Antónios recommendations) is just 5 to 10 minutes away.
I would come back anytime when in Lisbon! :)