Rodrigos apartment is located very central in a cute neighborhood with lots of small alleys. Almost right outside the door you can find one of the most beautiful miradouros in Lisbon (Miradouro dos Portas do Sol). From there you can take the tram 28E to some of the most popular tourist districts. Unfortunately, the great location of the apartment also implies less parking spots. I would not recommend traveling here by car. A quick stop to unload luggage will work though.
To get to the front door of the building, you have to walk up a few steps in between houses. It was a little hard to find at first, but Rodrigo answered his phone immediately and even helped us carry our luggage up the stairs to the apartment on the top floor. He was at all a very nice and helpful host. He even made it possible for us to store our luggage in the apartment until our flight.
We only stayed at the cactus house for one night, so we did not have to many expectations, but this place exceeded them all. It was very clean and comfortable with great attention to detail. One little thing that might affect taller guests: the bathroom is right under the sloping roof, so showering might be difficult. It was OK for us though.
In summary, we really enjoyed our stay in Lisbon and I think we could not have found a better apartment or host for this time. We highly recommend staying here.