The breakfast at Ivanhoe Guest House is highly praised by guests with many using words such as "excellent," "delicious," "fantastic," "lovely," "superb," and "amazing" to describe it. The breakfast is described as copious with a wide selection of hot and cold foods, including options for warm and savory dishes. Guests appreciate that the breakfast is freshly prepared to order and some mention that homemade dishes are served. The breakfast includes both buffet and menu choices and there are options for Scottish breakfast. The hostess, Janette, is mentioned as serving excellent English breakfasts made to order and some guests appreciate her welcoming approach. The service is described as friendly and efficient. Overall, guests consider the breakfast at Ivanhoe Guest House to be sumptuous with a great range of options to cater to everyone's tastes.