Kasia's apartment is really lovely, stylish and comfy. It's the ideal choice either for a short or a long stay in Lisbon. It was spotless and had all the basics and more.
The location is ideal to visit the city by foot if you don't mind strolling around. But if you do, bus and tram stops are nearby and you'll be in the city historic district in the split of a second. A taxi back home won't be much spending either.
Summing up I really do recommend Kasia's apartment and will surely repeat if I have the chance.