Seville was one of the cities we stayed in as part of our Portugal and Spain trip, and almost all accommodation units in Seville were full. Carmen's house was the best of all available. However, I think that the price is high due to the high occupancy rate in Sevilla and we did not get what we paid for. With the price we paid, we received both longer and better service from cities such as Lisbon and Porto. However, Carmen's house is a preferable flat if the price/performance balance is met.
Advantages: Very easy to check in, Carmen's communication is very good, The flat is located in the old town area, close to the train station, close to public transport, has everything you need in a house (including washing machine)
Disadvantages: Smell of humidity, noise from people passing by on the street, we saw a few cockroaches, toilet door needs repair, a bit far from attraction areas and good restaurants even though it is in the old city area