We have just spent 5 lovely nights in this apartment.
It is located in the heart of Alfama, which is a great place from which to explore everything Lisbon has to offer. Alfama itself is very charming with its narrow winding alleys, bars and restaurants.
The apartment is comfortable and has spectacular views of the river. The kitchen is fully equipped with everything one could need during their stay. The bedrooms are also comfortable although one of the bathrooms is a "wet room", which might not be suitable for everyone.
In summary I would highly recommend staying in this flat if you are going to spend a few days in Lisbon.