We stayed at this place ack in September this year.
The place is exactly as described. It is clean, modern looking and rather pleasant. We were very surprised how quiet it is, despite all the noise outside being right in the centre of Lisbon. The flat is nicely sound proofed so as soon as you close all the windows you don't hear anything. I guess in summer though it might not be suitable for some if you close all windows but do not fear, they also have aircon in there. ;) The flat has very good amenities nearby and lots of restaurants and cafes too. There is also a couple of local supermarkets nearby in case you decide to eat in one evening.
We felt very welcome on our arrival. We had some bread, wine, cheese waiting for us too, and these little touches made a massive difference.
Parking is very ideal. The hosts have access to a underground parking which is 200 meters away from the flat. We get given a ticket which gives you access to the underground parking at any time which is perfect as you don't need to worry about looking for space plus the car stays in the shade and ends up nice and cool during summer days.
I highly recommend the place to anyone wanting to visit Lisbon. It is close to all the major tourists bits if that's what you are wanting to do too.