10/10 would recommend.
Mario is a wonderful host and the space is just as pictured. I was able to arrange transportation from the airport to the space with Mario directly - I would highly recommend this for your arrival if this is your first time in Lisbon as the driver was able to show me where all of the attractions were and give me some great recommendations - super nice guy. Mario also has a home-made map of the area with bars, restaurants and grocery stores that was super helpful.
The location of this apartment could not be better. You are walking distance to everything and there's so much to do in the area. It felt extremely safe and welcoming.They also did a great job with lighting in this space, even though it is a ground level apartment with 1 window it feels nice and bright with the lighting.
I would 1000% stay here or at any of Mario's other properties.