Since we arrived in the apartment we had no hot water at all, as if the boiler was broken. To make the situation worse, the water was running from the shower each time we tried to turn it on, even though the apartment was supposed to be new.
The team in charge of the apartment was informed of the problems, and they said they would fix the issue, but the next day when we tried to use the shower again, the water was still very cold, and there was no difference what so ever. The issue was obviously not solved.
The next day, on our 4th day in a row without hot water (during our 5 days trip in the apartment); the team in charge pretended again that the problem was going to be fixed. We specifically told them that we would be forced to leave the apartment if we were still unable to take hot showers, given the price we paid and the fact that hot water should be the most basic service provided. When we came back during the evening that same day, we still only have cold water because they told us that the boiler was broken and that they needed to fix it.
In conclusion of this very bad experience, we thus had no other choice to leave the apartment early, and book a hotel for our last night in Lisbon.
The lack of a functioning boiler made our stay very uncomfortable. A basic service like hot water should have been available since the beginning of our 5 days stay in the property.