Glover's Cottage was a perfect spot for us. The apartment is compact but felt surprisingly roomy, and it was very thoughtfully equipped with everything we needed. The bed was extremely comfortable. The bedroom and bath are up 5 stairs from the entry landing, while the living room and kitchen are 6 stairs down, and also open to a patio. The kitchen is tiny--I would not want to cook a large meal there--but it is ingeniously arranged to include everything one needs, and it worked very well for our breakfasts and evening snacks.
As others have mentioned, the apartment opens onto a public pay-and-display parking lot, and you do need to pay for parking. However, parking is free between 6 pm and 8 am and we were out most of the day, so the cost was not great, and the apartment was so reasonably priced that we did not mind.
The one negative is that the Wi-fi connection is poor. We were only able to connect out on the patio or right near the back door.
Sherborne Abbey is a stunning building, and we enjoyed the town, which has great shops and bakeries. We also appreciated the beauty of the immediate area, and the easy access to the places we wanted to visit during our week, including Glastonbury and Wells, Montacute and Barrington Court, the Jurassic Coast, Salisbury and Stonehenge. The apartment is a few steps away from a fine Waitrose supermarket and several good restaurants and pubs.
The owners live right next door and were available to help if needed, and they were very friendly and helpful, from beginning to end!