Filipe was very nice and I guess if you need help (which I didn't need in my time there) he would have been also very helpful. The bathroom and kitchen were always very clean and tidy.
Maybe to help you decide if this is the right room for you, I want to say some things that I would have wished to know before...
The upstairs neighbour(s) were extremely loud almost every night (I stayed one week) and not just for a bit, also until 1 o'clock in the night. It was loud speaking but even worse sounds like moving furniture. If you are a light sleeper as I am, it will be not your place to be. If you don't bother and don't wake up for noise easily, go for it.
Maybe you also could ask the host before, how the situation is. Since I am not sure, if it is always like this or just the period of my stay there. And since it was my first airbnb in Lisboa, I don't know if it might be a common thing, having loud neighbours and/or thin walls and floors.
The bathroom is right next to your room and you should be prepared to hear the host and/or the other guest with their morning routines and sounds in there.
And if you are freezing easily and are maybe going to stay in a period were it might be a bit colder temperatures outside you should know, that the bathroom window has to be kept open at all times for the cat so you don't have a warm bathroom in the morning (or whenever) to take a shower. Also that, only relevant if you have a problem with it. If you don't mind and are a "hot blood", of course it will be fine for you. I would have liked to know before, so I am trying to give you some more detailed informations here...
The host and his wife are living in the flat, too. Their bedroom is right next to the rented room. It didn't bother but still felt a bit strange. It was more like staying in really just one room than using a whole flat with other room-mates.
Also there is a ringing-melody every time someone comes inside or leaves the flat. I felt a bit "watched" with it and somehow weird, since I didn't get the use of it.

You cannot use the kitchen before 9 in the morning, so if you like morning tea or coffe or breakfast early, you should know that.
Also the living room seemed to me more like a private situation, that I did not feel comfortable to use (and after 9 in the evening anyways you cannot use the other rooms apart from your bedroom). The living room to me was also pretty packed with personal stuff, so I didn't feel like using it with a good mood.
Again: Maybe just my personal problem, but I consider that important informations before deciding on renting.
You have the balcony right in front of your room and there are nice trees just in front of the building and it is a very calm street there. The balcony is also in front of the host's bedroom, but in my time there I could sit on the balcony in the evenings just by myself. That was really very nice.
All in all: A good room for that price if you just need a place to sleep and wander around Lisboa during the days!