A perfect place for a few days Vienna!
You can easy go by public transport to the main attractions. Also on walking distance do you find (15-20 minutes walk) Belvedere with botanical garden, shopping centre. And supermarkets are in a few minutes walk.
Good transport connection to the main Bahnhof.
Apartment clean, only fit for maximum 2 persons really silence no traffic noise.
I didn't meet Kiki but we have had good communication and key pick up went well.