Monse is a very nice host. She helped to carry my luggage upstairs and showed me on a map for places to check out. The apartment is small but very cute. She decorated the space very nicely and you can see that she is a detail oriented person. The apt is super clean.
My only issues were:
1. It is on 2nd floor on the street with bars so it can be very noisy. I stayed for 1 week. Mon & Sunday night weren't that bad but other nights and even on day times, especially on Fri, Sat can be very noisy. People here hans out till very late at night (after midnight).
Also, people who hang out at the bars smoke on the street so you will smell the cigaret smoke if you happen to open the windows. So keep in mind that you can't really keep the windows open. It was extra noisy during my stay as there was marching 24 hour non-stop drum festival on 1/19 and it was extremely loud so I could not sleep for a day and half. If I would have known the noisy level in general, to be honest I wouldn't have stayed here.
2. It was also very cold during my stay (1/19-1/23) and the heater goes on and off so during night it got very cold. I used my jacket as an extra blanket. Warmer blanket and heater that doesn't stop in winter would be nice.
In San Sebastian, in general I think everything is near by so you can easily walk around.
Everything was great except for the noisy level, cigaret smell and coldness in the room. Hope my review helped.