Location is everything here - everything in the Baixa-Chiado neighbourhood is walkable from this unit. The Time Out market is around the corner. Bed was comfortable and being able to do a load of laundry mid-way through our trip was a godsend.
Communication was great and they were able to accommodate us with a reasonably later than usual check-in.
With any city center, it comes with noise - and this is not an exception. If you're out all day walking, you'll probably sleep through it - or maybe you'll be out in the middle of it into the wee hours, but it's there and you should be aware of it before booking.
We didn't have an issue with it.