We had a lovely time in Fernandes's guest house. The location is super central, just be prepared to walk uphill a bit :) That shouldn't be a problem as Lisbon itself has tons of uphills, so it's just a part of the experience. The room itself was super clean and comfy with AC you can use. Before arriving I was a bit worried about the room being too hot as it is on the top floor, but was pleasantly surprised as we didn't even have to use the AC as the temperature was just fine. The guesthouse gets cleaned every day and the shared bathrooms are spotlessly clean. I would reccommend this place to young travelers and I'd definitely come back the next time I'm in Lisbon.