Answer:
The tone of this sentence is ironic. The use of the phrase "gaudily upholstered instalment-plan furniture" suggests that the furniture is cheap and of poor quality, which is not what the characters would have expected from the appearance of the place. The fact that the characters are not disillusioned by this suggests that they have low expectations or are easily impressed, adding to the ironic tone. The use of the word "fine" to describe the place also adds to the irony, as it suggests that the characters may not have a good understanding of what constitutes a truly fine establishment. Overall, the sentence suggests a tone of skepticism or even criticism towards the characters' perspective.
Step-by-step explanation: