I spent 3 nights in Lisbon as a solo traveller. The apartment whilst small was clean, modern and well equipped. The shower was hot and powerful and a good quality hair dryer was provided.
There is plenty of storage. The location was within walking distance to the main squares and central train station.
the walls of the property are thin and you can hear other guests coming and going. There is not a lot of natural light so the lack of heating could be a problem in winter months. On the whole the apartment was good value for money.