My family and I had a wonderful week in Lisbon. The apartment was quite a steep walk away from the centre, but we are keen walkers. You could get tram 28 if you don't want to walk (Although there may be a long queue!). The advantage of the location is that you get to see more of the city! The view from the end of the street is incredible! There are great restaurants not far away (including some vegan ones!).
The only complaint is that the shower head wouldn't stay up by itself, but we made do. Also be careful with the front windows - we got them stuck.