The hotel is warm, friendly and peaceful. The layout is simple and gives privacy and quiet, wooden floors and well thought out furnishings. The staff are simply the best staff I've ever encountered. They made helpful suggestions that enhanced my visit to Lumbini immensely, without being overly fussy.
The Japanese restaurant must be among the best in Nepal and an unexpected bonus. Many people only stay one night on pilgrimages from India but it is well worth booking in for a quiet weekend. You're a stone's throw from the beautiful Peace Pagoda and bird sanctuary and not far from the Museum and Northern Coach Park.
If you don't have your own transport then the staff will arrange it for you. (They dropped me at the coach park at 5 a.m.). As you are at the far end of the site, if you're a keen walker it's great for an amble down to the Mayadevi Temple via all the Monasteries. However if you're a backpacker then you're about 45 minutes walk from the town and main Coach Park for buses to/from Kathmandu.
However Hotel Kasai is worth an inconvenience. For me it is the perfect compliment to an amazing place. I'm looking forward to visiting again. I can't praise it highly enough for keeping such high standards and for looking after me so well.