rGoodData package provides interface to GoodData API. With it you can load report data in the raw format.

Here is a short example:

# Setup the required environment variables
Sys.setenv(GOODDATA_DOMAIN = "https://gooddata.com")
Sys.setenv(GOODDATA_PROJECT = "project-id")
Sys.setenv(GOODDATA_USER = "user-name")
Sys.setenv(GOODDATA_PASSWORD = "user-password")

library(rGoodData)
library(data.table)
# get data for a given report object-id
def.obj <- getLastDefinition(1213086)
uri <- getReportRawUri(def.obj)
dt <- getReportData(uri)