We spent one week with a family of 5 , in 2 rooms which were quite good and quiet. Service friendly. Next door to the Kirchheim Friedhof tram terminus, 15 minutes to downtown, extremely practical and cheap.
Autobahn one mile away to A5 and A6, no need to spend time entering Heidelberg city by car.
Parking no issue for the car at the hotel, safe and quiet.
However rest of Kircheim is dead city, apart of one pizza and one kebab and a Lidl supermarket, quite practical.
2 improvements to the hotel : Wifi access difficult (only in lobby, while in room switching off every 2 minutes) Restaurant good food but not very cheap.
We would certainly recommend to enjoy Heidelberg nice city (where you have to go everywhere by tram)