We were staying in Lisbon as a family of 6 - my parents, wife, brother and his girlfriend.
My parents picked up the key for the stay, and the four of us were greeted by the someone at the reception after arriving late at around 1:00 am later that day (taxi was only ~12 euro to the apartment). Our welcome was extremely warm and hassle free. We certainly appreciated the lift with our luggage!
Location is great - major metro station around the corner, great cafes on the main avenue around the corner, and a short 10-15 minute walk to the major areas of Lisboa. Although the street is right next to a major avenue, it is extremely quiet.
Finally with regard to apartment itself - huge space, with great features that all worked very well. We had some trouble understanding how the washing machine worked (limited Portuguese), but on calling up the hostel, someone was up within a few minutes to go over it with us.
We ended up renting a car for 3 days of our stay, and parking was attached for a small fee per day.
On checkout, the folks at the hostel was very accommodating us holding onto a key for access to the garage a little later than check out time.
All in all a great first experience !