The apartment was very well furnished and comfortable. If you aren't prepared to stay up until 2 am when the restaurants close the double glazing is very effective. Bairro Alto is very central for all the sights and has excellent travel connections around the city and, in the evenings, you don't need to go far for a good restaurant or bars.
The company also arranged for us to be picked up and taken back to the airport which was a good deal especially when you don't know the city.
We had a great time in Lisbon.