I'm going to start this feedback with a summary: our stay was very pleasant. Carlos is a very nice guy, always available to help and always with a smile on his face.
Now going into details of our stay. The check-in could be improved, we got 3 different messages about it and in the end we had to call Carlos just to tune how to do it. But it was nice to have a check-in without any contact with any other person (even more in COVID times).
The house was nicer than we thought, very spacious and very clean, but we already noticed that the photos changed meanwhile and it shows better the space. There was a couple's bed, with which we got problems - the bed was very very unconfortable (concluded with Carlos that it had wood panels on the mattress) - but it was promptly replaced with a new mattress, a single's bed and it seems that the couches can be used also as beds. One downside to the house is that it is in a 3rd floor without elevator (more a 4th floor because of the ground floor).
The kitchen was one of the best comparing to places where we have been. Fully equiped with all the necessary kitchen utensils. The fridge and the clothes washing machine seemed brand new and were great. Unfortunately, the oven is a gas oven and it was defective (also, it seemed that the only place that wasn't cleaned properly was the oven's tray, which was very dirty - Carlos apologized) - Carlos spent 2h trying to sort out the problem and this 2h were very pleasant, with a lot of talk - only time we saw Carlos.
The bathroom also had a big problem, the shower head was mounted very low and we had to change it.
The internet was also great, if it is very important for you, you have a connection with 200/100mbps (download/upload) and the wifi reaches every corner of the house.
In terms of transport, there is a bus close to the house (Rodoviaria de Lisboa, 317 - ticket costs like 3eur) which takes you to Oriente Station (train, subway and bus), departing every 30 minutes and taking, approximately, 35 minutes to arrive there. It is also easy to park near the house.
All the rest was great, a very nice month spent there. There is a very nice view for the Tejo river, the neighborhood was very calm and during the night there is a very nice breeze, which you could take advantage of to lower the house's temperature.
I would recommend it for a numerous family, friend's sharing a house or even a couple which like to have space for them.