My husband and I stayed 2.5 weeks and we had a great time. The location could not be better. It is right in the heart of the city with lots of amazing restaurants, cafes, shops close by. The check in was very smooth and we appreciated the bottle of wine as a welcome gift. The apartment is very clean and the view of the castle was wonderful. The kitchen is well stocked with everything you need to make dinner at home.
They had recently updated the internet and it was having a problem with upload speeds (download was fine). My husband had to work and it was a bit slow for him. We told them about it and they were trying really hard to fix it so it should be fixed now. The apartment is very quiet and totally protected from street noise. You could occasionally hear people next the master bedroom but nothing serious. We got stuck in the elevator one day for 40 minutes which was a bit scary (surprising as the elevators and building have been recently renovated)!
In general the place was perfect for our stay in Lisbon and I would recommend it to anyone.