Leonardo's apartment is so beautiful. The room and private bathroom were spacious and modern. It felt like staying at a 4 or 5 star hotel.
It's located in Malasana, which is pretty hipster, if you're into that. The room faces a direction that makes it quiet at night, which is nice for sleep. It's also very close to a metro station so you're well-connected to the airport/train/city. One thing to note is that the apartment building doesn't have an elevator, which wasn't a problem for me, but do expect to climb stairs.
Overall, almost too good to be true. Would absolutely stay here again.