Great apartment in a good and quiet neighborhood of Lisbon, very close to bus stops and in front of a big market which has nice fresh food and good small restaurants (I went there for lunch multiple times).
Also there are restaurants of all kinds everywhere around, and a self-service laundry service where you can wash and dry your clothes for around 10 euros (there's no washing machine in the apartment).
You will get a room inside a flat which is shared with other people (around 4 rooms per flat). The bathroom and kitchen are shared as well.
The wifi works well if you need it to work (200 Mb/s in download which was more than enough to work with my laptop for many days, and the connection is very stable).
Make sure to bring or buy a hair dryer as there are none in the apartment.
Very nice shower and big bathroom/toilet.
In the kitchen there's a dishwasher.
The apartment was very clean, and it's well taken care of, as it seems the rooms are cleaned multiple times every week (except yours, it will be cleaned only after checkout).
No air conditioning so it gets very hot in the summer.
No elevator, and the apartment was on the 4th floor, so it was a bit tiring to make 4 stairs every day (but hey, it's a good way to exercise for free).
The owner doesn't live in the same apartment, which I appreciate.
I also liked the self-service check-in with the lock on the main building's door with the keys inside, as it lets you check-in at any time after 10 AM until very late.
So all things considered it's a great deal for the price in a very good location.