Altido's place was amazing. It's located in a quiet private street near the botanical gardens, a great shopping district and within walking distance to a metro station. The apartment is very comfortable and has been just remodeled. The decoration is very chic and the bedding is outstanding with amazing sheets and very comfortable and plentiful pillows. Kitchen is very well stocked and there is even a small washing machine which is very convenient when traveling for two weeks in Europe. The management company is very professional and has a large office downtown where you can store luggage or get in-person help in multiple languages.
I would love to come back and stay more days next time. Lisbon is so large and full of attractions that a 3-day visit is just not enough. I highly recommend to fellow travelers to get the Lisbon Card which gives you free access to most museums and unlimited train, tram and bus rides within the extensive city network. Once you've been to 2 museums or taken 4 metro rides the card pays for itself.