Celso is a great host and will not only give you good tips for your stay in Lisbon, but also makes himself available for anything that might arise.
The location is really central and makes a lot of places of interest walkable. It's also very close to all types of public transportation.
As some have mentioned, it can get a bit noisy, but if you're a light sleeper like I am, this is easily fixed with earplugs.
Would definitely consider staying here again if I come back to Lisbon!