We were 4 people and we had a very good stay at Diogo and Cousins.
Vanda was assisting us with the whole process to get to the apartment and get the keys. Everything went smooth and according to the plan.
The photos are exactly like the place is, it's very spacious and clean. The house of tiles is located in a very bohemian and cool neighborhood. It is walking distance to major touristic points and also the metro, which is a very good plus!
I would say that the cons are that the gas heater doesn't support 4 people taking hot showers in a roll. We stayed in the first half of November and the last 2 people didn't have enough hot water to shower.
Also, despite the fact that they provided a washing machine (amazing plus!), they don't have a drying rack. There is just a very small once outside a window.
Another thing is the internet was very unstable. One of us had to stay home some days to work and it was affected by it.
Despite this smaller issues, everything went well and we would definitely recommend this place to stay in Lisbon.