One other thing to bear in mind with suggestions of negotiating as part of a job offer, I think, is the level of seniority of the role and the sector. That applies to travel class/having rest days but also to any other kind of “perk”.

Junior employees have relatively little freedom to negotiate as part of being offered a job - and little experience in how to conduct such a negotiation without appearing arrogant. The same applies to public sector (and related, eg higher education) roles unless you are really rather senior.