I cannot rate Luiz and the apartment high enough :) Literally every aspect of my stay was above and beyond what I could hope for. Luiz was super helpful with both local tips, suggestions as to what to visit, and with helping me get settled in. He lent me his metro card and got me a SIM card as well.
The studio is ideally located (for me, at least) and I had everything super close by. It's very well equipped, you have everything you'd possibly dream of for cooking, the shower is amazing, and the internet never dipped below 200 Mbps.
Since I was there for a longer period, Luiz arranged weekly cleaning, and frankly I would have extended my stay, had it been totally up to me.