My wife and I recently stayed here for 4 nights. The place is perfectly located for all the main tourist attractions (Cathedral, Alcázar). Seville is rather small so you can easily walk to everything. We even walked to the bus and train stations. It is about a 20 min walk from the bus station and 30 min walk from Santa Justa train station.
The unit is amazing. As others have posted the pictures do not do this justice. As soon as you walk in you know this place is special. There is lots of room in the unit and having 1.5 bathrooms was a plus. The kitchen is stocked with pots, pans, kettle, etc. As an added bonus There is a washing machine in the unit.
Karina is a great host and excellent with communication. We look forward to staying here if we ever return to Seville.