Apartment Needed in Summer: 13,12,14 districts (Vienna)

Does anyone know someone that would like to rent out their apartment in the summer?

In June and July we are having family visit from the United States. We are looking for a small apartment with a little kitchen where they can stay.

They are two older adults so ideally we would need an apartment on the 1st or 2nd floor if it’s a walk up. Or if it has an elevator that is great too.

We live in the 13th district, so a place in the 13th (12th or 14th) district would be ideal. (If the next bus, tram or subway is close by it would be great too).

Or does anyone know any good websites where we could find reasonably priced apartments? We have already checked AirB&B.

Thanks in advance for the advice.