We stayed at Emily's place for our trip to San Fran, everything was great. Both communal areas and private bedroom were super clean. Kitchen was well equipped and bed was so comfy! Emily was really comfy and accommodating with letting us checkin earlier and drop our stuff off.
We used the BART train, this was about 10 min walk away however there was also the CalTrain at the end of the block <5 mins walk away. Commute to San Frans touristic areas was approx 45 mins.
Area felt safe and we left our car at Emily's on-property parking.
The accommodation was on a main road and near the airport but the noise didn't bother us :)