Okay.... so this is a complicated review to write for a couple of reasons so I'm just going to go through it.
LOCATION: Firstly, the apartment is in a beautiful area, there are a bunch of places to eat and most of them were delicious. Piru goes through her favorites (and while the selection can be overwhelming, it's a great place to start if you're not sure where you want to go). A couple of personal suggestions for food... there's a place with a bunch of bull heads on the walls, they have a spectacular goat cheese salad and their tapas is 10/10 & there's another place overlooking the cathedral barely a three minute walk from the apartment and their fish of the day, octopus, and ox tail paella are something I will be dreaming of....
Outside of this everything is within easy walking distance from most of the main attractions in Sevilla and even the major bus and train stations are less than 30 min walks if you're planning on traveling to different cities while you're there. Overall, the location is spectacular.
APARTMENT: The apartment is gorgeous. The main living area, has a cute balcony that we stayed out on drinking wine and listening to the bustling activity below. Outside is noisy, but the windows are virtually sound proof, so that shouldn't be an issue for most people. One of the rooms was extended over a balcony for more space and it was an incredibly nice addition. We were only two people and the space was more than comfortable for that. Took us a second to find the washing machine but otherwise everything else was clearly explained and perfect.
There was one significant issue while we were there, however, and, quite frankly, until it gets resolved I wouldn't recommend a single person stay here. While we were there it was raining for a couple of days and the moment it started raining was the moment the apartment started leaking... and then flooding. I, personally, live in a place where there are monsoons that can cause problems with leaking but there seem to be some significant issues that go further than a couple of leaks here and there. The first day this happened we, by pure blind luck, decided to put some electronics and valuables away as opposed to on the counter where we normally would store them and we are SO happy we did. We walked into the apartment that evening to the entire kitchen and bathroom covered in water. The lights were dripping and it could have been disastrous. We thought that would be the end of it because Piru said that the workers upstairs would be working to fix it the next day (and they did... we could hear them) but, unfortunately the next day it rained and in the middle of the night we woke to the sounds of dripping and to a completely flooded floor. One of the bathrooms seemed to have water coming in through the walls, the walls were wet, the floor was soaked, and the electricity had gone out in the parts of the apartment where the water was coming through the lighting... I'm assuming a short of some kind but I can't guarantee anything as I know nothing about it lol. We put out buckets and pots to try to catch the water but the buckets and pots were constantly overflowing due to how much there was. When the rain stopped it eventually stopped as well... but, overall, there are a lot of issues that need to be fixed.
CONCLUSION: If the leaking was fixed I'd stay there again in a heart beat... until that happens, I wouldn't at all.