For accommodation you can get multiple options but Zee guest house is a good place taken care of by Mr. Dorjay Angchuk: 9469261374. The stay will be comfortable, hygienic and cheap if you aren't looking for luxury. For bike rental, Visit Mr. Tsering: 9797007434. The guy is cool and the bikes are well maintained. In case of any issue also, he will immediately come for help.
Better stay in zostel leh... its a nice place with a very warm hospitality by the owners... it is always throbbing with young crowd.... there is a bike rental place near zostel with name "yak bikes" they have bikes in excellent condition also owners are very helpful.... for stay during your bike trip to diskit hundar and pangong try looking for camps there only.... because things are always changing there.... no need to pre-book anything