I stayed here for a month and it was a wonderful stay. The roommates were very friendly and helpful, offering advice and conversation. The room was clean and they have someone come by once a week to clean the room and apartment. There is a little private terrace with a table which has great views, a big 4k TV, and everything you need in the kitchen. You will be living with roommates, so there will be the occasional dish in the sink, etc, but overall the others are respectful--just don't expect a hotel.
Even though the area of Graca is a little far from the center, it's still close enough to reach everything in 30-40 mins and I found it to be a very beautiful area and not too touristy--and also close to the beautiful Alfama area, only a 15 min walk away. I would stay here again.