problem with space in folder name

@echo off
set pathname0="/users/XXXXXXX/Backup_PC/Laufwerk_J/Eigene Bilder/"


"C:\Program Files (x86)\WinSCP\WinSCP.com" ^
  /log="K:\Test\WinSCP.log" /ini=nul ^
  /command ^
    "open sftp://xxxx:xxxx@sftp.hidrive.strato.com/ -hostkey=""ssh-rsa xxxx xx:xx:xx:Xx:xx:xx:xx:xx""" ^
    "cd %pathname0%" ^
   "synchronize remote J:\" ^
    "exit"

set WINSCP_RESULT=%ERRORLEVEL%
if %WINSCP_RESULT% equ 0 (
  echo Success
) else (
  echo Error
)

exit /b %WINSCP_RESULT%

> 2017-02-06 20:07:47.296 Script: cd "/users/xxxxx/Backup_PC/Laufwerk_J/Eigene
. 2017-02-06 20:07:47.296 Changing directory to "/users/xxxxx/Backup_PC/Laufwerk_J/Eigene".
. 2017-02-06 20:07:47.296 Getting real path for '/users/xxxxx/Backup_PC/Laufwerk_J/Eigene'
> 2017-02-06 20:07:47.296 Type: SSH_FXP_REALPATH, Size: 53, Number: 272
< 2017-02-06 20:07:47.374 Type: SSH_FXP_STATUS, Size: 29, Number: 272
< 2017-02-06 20:07:47.374 Status code: 2, Message: 272, Server: No such file, Language: 

set pathname0="/users/surfer-01/Backup_PC/Laufwerk_J/Eigene Bilder/"
"cd ""%pathname0%""" ^