The location known as the Upper Room today (also known as the Coenaculum or Cenacle) is from the time of the Crusaders as evidenced by the architecture. On the first floor below this room is the traditional tomb of David. The "tomb" indicates an early Jewish-Christian presence or possibly a synagogue. If so, this could support this general area as the location of the biblical Upper Room.
During your visit to Israel as you ascend the mountain of God imagine waiting in the upper room with all 120 of Jesus’ disciples studying Moses, the prophets and the Psalms with one mind, one heart and one voice.
“When the day of Pentecost had come, they were all together in one place. And suddenly there came from heaven a noise like a violent rushing wind, and it filled the whole house where they were sitting. And there appeared to them tongues as of fire distributing themselves, and they rested on each one of them. And they were all filled with the Holy Spirit and began to speak with other tongues, as the Spirit was giving them utterance. Now there were Jews living in Jerusalem, devout men from every nation under heaven.” Acts 2:1-5