Really cool apartment, the interior is simple but has a good style. It is located in the best place in Alfama district. The company that hosts the apartment is very helpful, friendly, and professional - I would totally recommend renting from them. They even allow you to keep your luggage in their locker for the day when you leave, which is a really nice touch.
The only downside is that the walls are not soundproof, and you can hear the steps from the apartment above you. If you are not a deep sleeper this will be annoying. I think adding the very basic goods to the kitchen (salt, pepper, coffee filter) would be nice as well.
Overall a good value for the money, I would recommend it.