One of my favorite romances to date... and I'm writing this review almost 4 months later!!!
I loved how original the plot line is (strangers sharing an apartment, falling in love through sharing NOTES, chasing down a long-lost lover of an old person?)... just a nice strangers-to-lovers vs. the typical enemies, friends, etc. I loved that everything was done with good will towards respective partners. Both characters (Tiffy & Leon) are super likable, but deeply developed at the same time. Leon is very quiet and Tiffy is spunky, so she really helps him open up. 
I am also a sucker for a "two people who don't know eachother go on a trip together" trope, and this book brought that HOME. Love love love!!!!