Berlin can be a bit hit and miss with hotels sometimes...fortunately, the Grenzfall can be relied upon to give exactly what you need from a visit to the city! The rooms are spacious and clean (it helps that they aren't carpeted but, although that seemed odd at first, the material they use is clean, warm and practical) and the fully opening windows add to the light feel. Location is superb being at the point where the Wall used to meet East and West at Bernauer Strasse, the more tourist centric part of the city is a fifteen minute walk or quicker from the M10 tram stop or U-bahn station around the corner. Incidentally, Mauerpark "flea" market is 500 yards away for a fun filled Sunday.
The hotel prides itself of being inclusive in it's staffing make up and as such is well appointed for those with any mobility issues. The staff (especially Marion on reception) are helpful, knowledgeable, friendly and accommodating throughout the hotel...nothing was too much trouble. The garden was charming and never too busy even in the very pleasant weather I enjoyed and the café to the side of the hotel (connected) was again precisely what you need for a brief stop off. Whilst I was a little unsure about staying in a 3 star hotel, I couldn't have asked for better! All in all, I would certainly stay again and recommend to any visitor making a stay in Berlin to consider the Grenzfall as their base!
(oh...and the shower was perfect!)