Ruben and Teresa were kind and welcoming. Teresa collected me and Ruben showed me around the facilities.
The room was small but had everything required. The bedrooms have modern locks, so you can be confident that your belongings are safe inside. The bed was very comfortable and clean.
The location is fantastic. It's close to the airport, the city and Lisbon's famous aquarium. All could be considered walking distance (I walked from there). There is also a nice park nearby.
Ruben's is a good place to stay are travelling solo or as a couple. It's also good if you want to be close to Lisbon or the airport.
Just be careful you don't bring too much luggage as there isn't a lift.
Overall, I am pleased with my experience. Also, Ruben has a nice selection of cakes and coffee at the ready.