OMG .... you can do it yourself .. self-help ..: D But only if the parquets are not very loose ... (there are no big holes between them) You only need ... a big floor sander .. it can be borrowed in OBI ..Baumax .. in the rental section you like ... it looks like this .. >>> There are several types of such machines ... you just regrind the parquet and you put small holes in the overcoatable acrylic sealant ... for sale in the cartridges .. the sealant is then sanded very easily by hand or with a drill with a rotating Velcro attachment .. A small rotary grinder and the like .. but if you do not have a grinder, manual sanding is enough .. Then you visit Paint colors ... there you choose wood stain. .if you want some shade ..if you don't leave that ..which is there .. then clean wood ... Then just buy a water-soluble floor varnish and apply to the floor with a large roller (let it dry for at least 24 hours or drive instructions on the cover of Laku) ... in the final it looks like a pro ... it will be a lot cheaper ... But most importantly ... You are Czech and every guild is not just a musician but also has golden Czech hands ....: D If parquet floors are too loose .... then you better let it be done. ..when the tightened parquet is not any extra hard work, it's the nerves I'll tell you ... you tighten in one place and on dryhem you start you have to tighten the lines .. with the help of a nail ideally small ... the squirrels can be pulled again putty ... and regrind only if you have never done it in your life .. it will be a bit of a nut, although in its essence it is the same as tightening the floorboard .... So with the help of rope tighteners (hacks) or using a wedge ... : D Personally, I wouldn't let the company do anything but gas ...: D ☢ ☠ ☣ ☠ ☣ ☠ ☣ ☠ ☢