I had a really good time in Leonardo's apartment. The apartment is located in the city with only a 10/15min walk into the heart if Lisbon. I would describe the area as very cool/hipstery surrounded by some lively bars and restaurants with vegetarian/vegan/glutenfree options. Therefore I recommend bringing some earplugs along, since Lisbon never sleeps ;)
The room I rented war very clean and well put together. I didn't use the kitchen during my stay but it was always tidied up. The shared bathroom had its ups and downs regarding the hygiene; people were using it after all ;)
All in all a wonderful stay and I would definitely recommend visiting Leonardo's apartment!!