Pros: calm, clean, safe place, fully equipped; Ali, the host, is nice, available and helping.
You have a few places to go for food nearby, like the "Tiffin Cafe" just 1 minute away, walking, where you can have very nice breakfasts, as a recommendation; or the "Donna Pizzeria", a bit further, with very good pizzas or "La Boulangerie", just next to the place, to have a beer in a nice spot (not so cheap).
Of course, there're more places over there, but we were walking around the rest of Lisboa, which is pretty big, so... ;)
Cons: the place needs a few fixes -at least the apartment we were on-, I guess Ali will take care of them easily.
Another detail: very, very steep stairs to access the place; if you have problems with that (some mobility problem, for instance), I'm afraid that's not your place, sorry. Anyway, again, that's the apartment I was assigned, maybe there're others with a better access, so, check it with Ali.
Just what it is: parking in the proximities is easily available, but regulated, so, you can choose to park on the street and keep track of tickets, even once a day, or park in a 10-minutes-away-walking subterranean guarded parking at Parque Infante Santo, pretty cheap, also, like 6.5€/day. If you're not going to use the car, that's my choice.
Also, and I do not know if this a "con" or just "what it is", it's not near a metro station, so the 24hh ticket (which is the most used by tourists) is a problem now and then, as it needs to be obtained in a metro station or in some stores (that I guess are like unicorns, as I did not see one, but I'm a tourist and I do not speak the language, so... :P ). Anyway, first day you need to walk about 20 minutes - or pay 3€ for each single ticket- to the nearest station, Cais Sodre, to get them, and then, if you miss your 24hh deadline (straight, from 11:32AM to 11:31AM next day) before renewing it, you need to walk - or pay single tickets- again to get it; a question of organization, but important.