Since there were likely only a few houses that could fit 120 people in an upper room, and given the increased number of visitors to Jerusalem, it is very likely that they met in the same upper room as before (though this cannot be confirmed).1 Wherever they met, it was a relatively public place or close to where lots of people were moving since it did not take long for a crowd to be drawn to them.2 Most likely it was also near the temple complex.3
1 When the day of Pentecost arrived, they were all together in one place.