You will need a car if you are a wheelchair user and want to visit this place as it is quite far away to the nearest shops or restaurants and the sourroundings are not too wheelchair friendly. Only for sleepover? Easily book this place, so. Otherwise, I would not recommend it. During the summer, breakfast is served outside and to get there you need to go through old paving tiles, grass and small slope. (about 10 meters total). Kitchen is a little tight. In the bedroom, you might ask to move the bed to the side if there is not enough room to get in. All these drawbacks are of no significance really, if all you need is a 100% accessible bathrom (there is just about 2cm high threshold around the shower).
More information and booking at B&B website < Agriturismo Biologico dell Etna