The apartment is very well designed from an aesthetic point of view and the rooms get reasonably good light. A lot of minor things broke while I was staying - in my and others' rooms, but to the host's credit they fixed everything very quickly, although this meant that there were often people making noise to fix stuff while I was working from home. The hosts are making an effort to fix things, but I think they need to fix a few more things to make it a more hassle-free experience for guests.
Kitchen is pretty good and its only a 20-minute walk / 10 minutes public transport from the centre of Lisbon, so pretty good.
My backpacks got mouldy from staying in the room for a week, which I am not happy about, so that is the most important thing to deal with in room D.