plus: Simple but spacious apartment, good location and proper (although very impersonal) communication about arrival.
con: We had a decent time in Vienna, but the apartment was not as we hoped. We payed a fee for cleaning, but found hairs in the bedroom and bathroom of former guests, toothpaste stains around the washbasin and bathroom cabinet, dust/dirt on the rim of the bed. There was also a very strong unpleasant smell in the whole apartment that we couldn't seem to get rid of, despite opening all windows. Also there were no curtains, which isn't bad if you rise early, but makes it hard to sleep in after 7am.