I've stayed a this hotel for two nights. The pluses: very good Spa procedures, good breakfast, good location, helpful staff, clean hotel, good bathhuoses (turkish, sauna, infrared rays), natural mineral water near the Spa.
Minuses: very basic room (not for 4 stars hotel): uncomfortable bed, not enought light to read; bathroom with light green bricks, in shower was device for liquid soup, but it was empty, the pools are too much chlorinated (there was one little pool with less chlor, but too cold.

We stayed there end of September, took a suite. It had a bedroom living room with 2 sleeping sofa and small kitchen with fridge and kettle. Some cutlery and microwave could be very appreciated. Hotel is clean and nicely decorated, the breakfast was OK. The hotel is surrounded by nice park, the big lake is nearby.
Spa center is very good, there are treatments for couple and special for kids. Our daughter used childrens playroom while we had enjoyed Spa for two. Staff is very attentive, they really made us feel special. We liked that all the information was available on several languages (English, German, Russian, Polish), and the personnel also speak several languages.

Just one negative moment - we had booked via booking.com for 2 persons, but took our daughter. It was written on the website that additional bed would cost 15 EUR, but when we checked out we had to pay twice more. Ladies on the reception told us it was because of high season, however we though they should have either provide booking site with the correct information, or instruck the reception personnel to stick to priced offered by booking engine.

The hotel is quite good, but on my opinion is a bit overpriced. The food selection is not that reach for that money. Rooms are clean and light. Staff is quite friendly and helpful.

You go to Druskininkai to relax, recuperate and feel pampered - so I will first list reasons why this hotel did not live up to these expectations:

1) Walls between rooms were extremely thin - no chance of rest or privacy whatsoever withough earplugs
2) Service could have been better - more smiles, more helpful, more "client is right" attitude. It's a four star hotel, after all. The dining room staff were good, however.
3) Rooms - quite small, no special toiletries, more of a 3 star standard.
4) Swimming pool and especially jacuzzi could have been bigger.
5) No wi-fi (at least free wi-fi) in rooms - only in the general areas downstairs.

The good bits:

1) The spa centre is beautiful, massages done well, nice resting room with tea, blankets, etc.
2) Food is good - Lithuanian with a healthier twist.
3) Being in Druskininkai in general - good air!
4) The conference centre, bowling, bars and all on site - convenient and well-renovated.