I and my friend stayed 3 nights in this apartment. It's a very spacious, modern, tidy and best located flat. literally, 3min walking from Seville cathedral. Even if it's in the city centre it's quiet and we both slept very well.
Wifi was working alright, we had no issue with it. Since it's an old house we felt a bit of humidity but I know there is not much to do about it.
The host was very informative, communicative, always asked if there is anything what we need. We got some tips on where to go to eat and we were impressed by the food and prices. We were also allowed to leave our bags on the leaving day and that made our day so much easier as we didn't have to carry them since our flight was late in the evening. Highly recommend the apartment