First of all (and despite everything) we would like to thank Sueko and Mafalda for our stay in Lisbon. It was not completely perfect but by and large we enjoyed our trip so we want to enumerate all the pros and cons.
Pros of this apartment:
1) The district (Alfama) is very nice: you can feel there the real atmosphere of Lisbon with its narrow streets, beautiful sights and little lovely cafes where you can taste famous ginjinha. Alfama is known as a tourist part of the city so you will also find there Castelo de São Jorge and observation platform.
2) The apartment is new, clear and clean.
3) It is not very expensive (comparing to other offers in Lisbon).
4) You have almost everything you need: hair dryer, microwave, fridge, cooker (but only one burner works). We didn't find the teapot but maybe Sueko and Mafalda have it.
5) Wi-fi was quiet fast.
6) Bathroom was really small but there is enough space to take shower. There was just one not comfortable thing - no holder for a handshower.
Cons:
1) There is no wardrobe or even bureau so we had to leave our clothes in the suitcases.
2) Many things in the apartment are jerrybuilt (it's not a real shortcoming but once a shower curtain fell down with the stand).
3) There is a smell of mustiness from the litter basket.
4) As we said there are a lot of restaurants and cafes around the street we lived. One of them was just near the entrance door. That is why it was very crowded during the dinner and supper hours and people were standing in line not far from our door. If you come home after midnight it's ok but if you plan to go to sleep early or to have an after-dinner nap you should be ready to a lot of noises behind your door (it wasn't a big problem for us nevertheless).
5) Sueko and Malfada are good and friendly hosts, they gave us some advices about supermarkets and restaurants in the city. But they don't always answer the questions in time.

To sum up what has been said the apartment is convenient for people who are looking for a nice and not expensive place to live in and are not planning to spend a lot of time at home but want to enjoy the charms of wonderful Lisbon.