Arboretum Cafe in Lincoln is highly praised for its exceptional breakfast offerings, particularly the Full English, which is described as the best in the city. Customers appreciate the beautiful outdoor seating and dog-friendly environment, as well as the warm and clean indoor seating area. The staff, including trainees like Ruby, are commended for their friendliness, attentiveness, and caring service. The cafe is also noted for its excellent prices, good portions, and accommodating dietary preferences, including vegetarian options. Despite being a training cafe, the quality and consistency of the food and service are consistently high, making it a favorite among locals and visitors alike.