Perfect location! 5 minute walk to the metro and the 28 tram (which most people will use on their first visit to Lisbon) is even closer. I didn't get to meet Gonçalo in person but he was friendly and helpful over messages, and sent me his helpful tips on good places to see/eat etc.
The apartment itself was full of quirky decorations as per the pictures. It's up a few flights of stairs but the plus side of that is that you're further away from the noise of the street - it's right in the middle of the night life district which is a big street party, but it was quiet once I was inside and in this central part of town it's always going to be a tradeoff. I had no trouble sleeping! There were no records for the record player so it was really only there for decoration (but it worked as an FM radio). Also strangely there was a kettle but no tea/coffee, no shampoo or soap in the bathroom either... There is a cheap supermarket within walking distance though. Bed was comfy and Wi-Fi was strong!
Nice comfortable place to stay with much more personality than a sterile chain hotel in a perfect location. Would recommend it for sure!