This is going to be a bit long of a review, but I hope it's going to be useful both for Pilar and Alberto and the guests that will make usage of this flat. I'll start with what went very well, and then I will explain what we didn't like and why.
What went well:
The apartment is very centrally located, and it feels like home. It's cozy because there's a few details in the decorations that do not make you feel like you are in an Airbnb, but as I said, make the place feel like home.
It is great that you can have your pet with you in the apartment, as finding pet-friendly accommodations is not super easy in Spain.
Overall, the flat was comfortable. Even though it's in the middle of the city center, it's quiet and it's very cool (which was fantastic, since there was 30 degrees outside during the day). We were in Sevilla during the last days of the Semana Santa (Holy Week), on the Saturday and the Sunday of the Holy Easter weekend, and of course we could hear some noise outside, but considering that there was everybody in the streets to commemorate the death and resurrection of Jesus, I have to underline that it was fairly quiet inside. What was really good is that we could see the "pasos" (processions) directly from the main door of the building, as the people were passing through Calle San Luis! This was very very nice for both me and my parents, as we could really see the "procesiones" super close :)
What could be improved:
There's a couple of things that we (as a family) really didn't like from this stay.
The communication with Pilar and Alberto was easy and clear, however, when we got to the flat around 15 o'clock (check-in is from 13 o'clock), there was still the cleaning lady cleaning the flat. I told Pilar and Alberto that we would be in Seville already from 14 o'clock, so this was a bit annoying (as we were coming from a 3 hours car ride), even though the cleaning person was very kind and sweet and she was nearly done with the cleaning. She asked us for an extra 30 minutes, so we went outside to eat something and then went back.
Once we made it back to the flat, there was no towels, but they were brought to us nearly immediately, so that's ok... however, after 5 minutes we got the towels, I was asked to pay for the dog, even though I already paid for the extra fee! I found that a bit unprofessional, since I paid that in advance together with the flat, and Pilar and Alberto insisted a bit about the 10EUR to be paid.. I have to say, that was also fixed quite quickly, since they wrote back to me that they found the payment, however my suggestion is: first, ensure that you got or didn't get the payment, then you can ask your client for the payment in case you didn't receive it.
Final note: the bathroom needs renovation. You cannot ask 170EUR per night for a flat where the bathroom is extremely small, the shower/bath is old and the shower head doesn't even stay up in the hold that is up on the floor.... so either you lower the price for the flat, or you put some effort in renovating the bathroom.
To Pilar and Alberto I would like to say: I hope these improvement comments get taken as they are, i.e. suggestions to improve the experience for your guests. Our stay was overall ok, but for the price we paid, we expected a bit more.