I stayed at Alexandra an Pedro's place for over a week. It is absolutely gorgeous apartment. Really clean, equipped with everything you need to have a comfortable stay, with very nice touches, and fast internet. One of the nicest apartments I stayed in Lisbon.
The only downside is the electricity which goes down very frequently. For example washing machine on its own will cause fuses to blow. It is problematic if you are working remotely because you can't really work, and you can't really leave the apartment.