I used the SN lounge few days ago, since my preferred option (SK-lounge) doesnīt open very early. I entered the lounge at 6 AM and departed at 07.10 AM for FRA. There were few choices for breakfast (croissants and cookies with jelley and honey and some fruits). The restrooms are far apart, in fact, you have to even pass the checkpoint counter. I guess, however, you will only get access to this lounge being a LH-Senator or a SN FF.

Opposite side to the SN lounge is the Restair Diamond Lounge what should be open to you (*G). I did not try this lounge yet.

If the SK lounge is open at the time of your flight I would definitively try it, since it offers a nice selection of food, free Wifi and is quite large and quiet. There are also restrooms accessable from the lounge.

Itīs just straight passing the entry checkpoint where you have to take a left turn to access the SN and Restair lounges.