Carlos place is brilliant, a very modern and relaxing apartment.
Carlos was very responsive to questions and cleared any queries we had.
I'm always a little apprehensive with self check in/lockbox systems but the instructions are clear and getting into the apartment was very straight forward.
There is parking outside the apartment on both sides of the road, but spaces rarely become available.
The flat is lovely, very modern inside, felt like a home away from home. The beds were all comfortable, temperature inside was perfect. The shower is amazing! And the kitchen was superb, with all the mod cons and essential crockery/cutlery you need.
The locality is great, there are numerous supermarkets within a short walk. It's away from the 'touristy' areas so you're really mixed in with the locals. It was about a 15-20 minute walk to cross the canal and get to the main part of Seville (to see the Royal Alcazar, plaza de Espana etc) so despite being in Triana seeing the rest of the city is not difficult.
The only real drawback of our stay was that the surrounding neighbours were a little too noisy in the late evening for our liking. This may just be because we're not used to living in an apartment and the fact that the Spanish tend to stay up late. But overall it didn't have a negative impact on our stay.
I would strongly recommend Carlos base as a place to Explore the fantastic city of Seville.