I originally chose this program with Adelante because it was by far the cheapest one available. The price is reasonable and includes meals and housing-- both of which turned out great. I loved my host and the meals she made for me. I felt at home there. Also, Sevilla, in general, is a beautiful city that is very safe, colorful, and walkable.
The university (UPO) is not within walking distance but has its own metro stop so getting to class is easy and convenient. The courses required some work but were not overly stressful. Adelante was helpful as well with connecting me with a local study abroad program and continuing to check up on me through email throughout my stay. I will say that the program works best for students that are independent, as Adelante representatives will tell you. Many other programs are so expensive because they have some trips bundled in the cost-- this is not the case with Adelante. So, if you are interested in planning your own trips and activities around Spain/Europe with more flexibility, this program may be a good fit.
You also may want to consider how willing you are to meet new people and try solo travel for the times when the schedules of other students who have more boxed-in programs don't align with your travel plans. These aspects worked for me and I got to travel a lot with the money I saved by choosing this program-- also, there are many student/erasmus travel programs for the weekend like We Love Spain which I also would recommend. Sevilla is a beautiful city and I had an awesome time there. I gained a lot of confidence in myself during my stay there and would highly recommend it!