We highly recommend Carmen's apartment in Sevilla.
It is ideally situated. Although it's on a shopping street, it is set back from the street and blissfully quiet. It is a short walk to the Cathedral and other landmarks. It is handy to grocery stores, cafes, and restaurants.
We stayed for most of February and March. The heating system worked well, and we were always comfortable. It was great to have a washing machine in the apartment. It helped to have a private patio, where we could hang the clothes out to dry.
The apartment is sufficiently spacious that my wife and I didn't feel cramped over the course of our lengthy stay.
We were both doing some part-time online work while there. Fortunately the bandwith of the apartment's wifi was sufficient to our needs.
Carmen is an attentive host who quickly handles any questions or concerns.
We were thoroughly pleased with our stay at this apartment.