Overall the place was good. 3.5 to 4 stars out of 5. The good points of the flat were as follows:

1.Location: The location is right in the centre of Bairro Alto which is totally awesome. It’s in the heart of Lisbon where all the night life is so if you want to part hard into the night, this is the place to be. However, if you are a family with young kids, I wouldn’t recommend this place as there is a lot of noise in the night and there could be a difficulty in sleeping.
2.Flat: The flat itself is quite new, well-furnished and well-spaced. It is ideal for three people in terms of the space provided.
3.Host: The host was really nice. She recommended a dinner place run by her friends just a minute away from us (Antonio) which was quite nice. She even took off the bottle of wine from our dinner bill as a sweet gesture. 

The negatives of the flat were:

4.Hot water: The water tank is NOT big enough for three adults to take a shower in the morning. This was quite disappointing as the hot water would keep getting finished and it was a bit of a hassle.
5.Sink blockage: The water wasn’t draining well in the shower area which was a bit annoying.
6.Basic toiletries: I’ve been to other Airbnb flats before but this one only had a liquid soap to wash one’s hands in the toilet. One has to get one’s own toiletries and can’t rely on this flat. I would suggest the host to just get few basic toiletries such as shampoo and shower gel.

Overall, I would still go back to the flat but hopefully my suggestions would be taken into account for the future. I did have a great time in the flat and am totally in love with the city of Lisbon!