Susana's place was clean and comfortable, right by the lively Alameda de Hercules which is great for bars and restaurants, while itself being on a quiet residential road. It's on the ground floor so it's easily accessible and the centre is about 15 mins walk from the cathedral and alcazar. Also close to a number of vegan cafes/restaurants and the feria market. The flat itself doesn't get that much light (I visited in late Feb) but you'll be out exploring the city anyway! I'd definitely recommend staying at Susana's apartment if you're in Seville :)