(Not to be confused with Saturday Night Live's Love Toilet…)
So, what is this àixīn wèishēngjiān 爱心卫生间 if it is not a "Love toilet"? There's no problem with wèishēngjiān, which does mean "toilet", but àixīn 爱心 can mean "love, benevolence, compassion". In this case, àixīn wèishēngjiān 爱心卫生间 is a toilet made and/or maintained by a benevolent or charitable group for those who cannot afford a pay toilet.
Incidentally, the photograph above was taken in the Sibsongbanna (compare Thai Sipsongpanna สิบสองพันนา ["twelve thousand rice fields"]) Airport in the heart of the Tai-speaking area of southernmost Yunnan Province.
[Thanks to Gianni Wan, Fangyi Cheng, and Rebecca Fu]