Simple question, How to summarize rows

It depends a little, on what you want to achieve. Do you want to model the Data in PowerQuery to match this structure? Then try Grouping:

let
    Source = "Your Source!",
    #"Group" = Table.Group(Source, {"Place"}, {{"Description", each Text.Combine([Description],";")}}),
    #"Split Column" = Table.SplitColumn(#"Group", "Description", Splitter.SplitTextByDelimiter(";", QuoteStyle.Csv), {"Description.1", "Description.2", "Description.3"})
in
    #"Split Column"

Edit: this will be the output in Table View:

If it is merely a Question of Visual representation try a Matrix and add both Data Fields to the "Row" Section.