Great place to stay while in Lisbon. Nice quiet street and wonderful location with everything you need within steps. Really lovely apartment as well.
Only downsides are that check in is a bit of a complicated process as you have to walk 5-10 min to a hostel to collect the key. Part of this walk is uphill so take this into consideration as it can be difficult with lots of luggage. Hostel to pick up key is also very hard to locate (4th floor of a hard to notice building - bad signage). The lock to the apartment is also very difficult to operate - make sure you pull the door towards you before trying to unlock - just made things less easy on top of the above.
The cleaner also tried to come in before we had checked out the last morning we were there. We still had half an hour before the check out time so was not appreciated.
Overall, a great experience staying here and would definitely recommend despite the above!