The lobby is not the biggest but give a good space feeling due its decoration.
The exterior looks like any other good buildings in the historic area of Madrid.
The Petit Palace Mayor - Plaza 4 star hotel features 66 modern and tastefully decorated guest rooms, some of them accessible for disabled people. All rooms include a 27" flat-screen satellite TV as well as a laptop computer with free wireless Internet access. High Tech rooms feature a king size bed and include an exercise bike, a valet press and a shower with sauna. Family rooms have either a king size bed or two beds and a bunk bed.
The hotel has its own restaurant were the breakfast is served. There is also a lounge for a more casual atmosphere.