Veronica's apartment is a good choice to stay in San Sebastian...if you are willing to compromise.
GOOD STUFF: Veronica is nice and quick to reply. The apartment is quiet, chilled and dark, meaning we had the best sleep in weeks. No sound, no sweating, no light.
It's also well positioned, near public transports and city centre just at 20 min walking + you have 2 bikes available.
Kitchen is nice and clean.
Addedd bonus: there is wifi, even if the listing says the opposite.
COMPROMISES: it's in an underground floor, which makes it chilled (sometimes cold), dark and gets quite humid. The shower is positioned in a corner in the living room and has a transparent door (not an issue for couples).
The bed is actually a sofa bed, not incredibly comfortable but not uncomfortable either.
CONCLUSION: Veronica's place is a good compromise if you are planning a short stay in San Sebastian, especially in summer time when you can enjoy a chilled shelter from the sun.