For clarification this museum is known as the 'Polish Land Forces Museum'. It holds relics related to the history of the army from the Middle Ages, through the wars of the 17th century, national uprisings, battles for borders in 1918-1921, World War II, to the participation of Polish soldiers in peace and stabilization missions around the world.
Most of the objects are housed inside a typical large 2 floor symmetrical square communist building although you will find plenty of military hardware outside the front such as tanks, mobile missile platforms and guns of various calibres. It is very easy to reach via the main tram and bus network, only taking about 10 minutes on the tram if travelling from the city centre.
You enter through the front, and are lead into a large hall to the right which is fairly empty, but with various information banners provided in Polish and English which explain the development of the museum from its foundation to the present day (I think they also use this room for events). One can see the museum is no longer static, but holds more events such as modeler gatherings, historical re-enactment and an active campaign of collection.
The main part of the museum is upstairs across the entire second floor with many objects held in large glass display cases, some even as part of large dioramas. The organisation is laid out logically, from the beginning of the polish state, through to the present day's involvement with NATO and peacekeeping operations. Information text is provided in English and Polish. There is a lot to see here, from day to day infantry equipment, uniforms of armoured divisions, ration kits, shell casings, light guns etc. I spent the majority of my time at this museum on this floor.
You come down the stairs again on the other side of the building to the last room, which is used as a temporary exhibition space, which when I visited was about the development of Polish light machine guns during the inter-war periods and second world war. Quite specific and interesting.
The museum does not have a lot of interactives. There a couple of touch screen desks as you go round, but do not expect lots of large flashy projections, which are typical of more modernist museums today. Then again I quite like this museums layout and approach. I spent about 2 hours having a look round, and thought it well worth the visit, particularly if interested in military history.
In terms of accessibility and facilities there was a chairlift to the 2nd floor, and seating was present in each exhibition space. Toilets are in the small basement downstairs, and were kept very clean. There is also a small shop with showcase of products in the entrance lobby with the ticket desk. When I visited entrance was free but the shop closed with only security present - they were friendly.